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育种：修订间差异

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== Trait inheritance ==
== Trait inheritance ==
=== Congenital traits ===
Congenital (also known as genetic) traits can be inherited by a character's offspring. Although genetic traits must be visible ([[#Active and inactive traits|active]]) to provide stat bonuses and other effects, a character may also carry recessive ([[#Active and inactive traits|inactive]])  traits which are invisible, yet can still be inherited by one's children.<ref>"[Genetic traits are] visible, though characters can also carry recessive traits... those are not visible, but can be inherited by their offspring!" [[forumpost:26089470|rageair's reply]] in CK3 Dev Diary #7 - Characters & Portraits thread</ref>
Congenital, or genetic, traits can be inherited by a character's offspring. Although genetic traits must be visible to provide stat bonuses and other effects, a character may also carry recessive traits which are invisible, yet can be inherited by one's children.<ref>"[Genetic traits are] visible, though characters can also carry recessive traits... those are not visible, but can be inherited by their offspring!" [[forumpost:26089470|rageair's reply]] in CK3 Dev Diary #7 - Characters & Portraits thread</ref>


=== Active ===
There are some traits that are inherited by children, but do not use the active/inactive inheritance mechanic. In the context of this section, the term ''congenital trait'' excludes such traits. It also does not include traits that are [[Descendant trait|non-genetic, yet inheritable]].


First the chances of acquiring the trait as an active trait is checked as a function of the parents:<ref name=Defines>{{cite file|common\defines\00_defines.txt}}, <code>NChildbirth</code></ref>
=== Active and inactive traits ===
A congenital trait may be either active or inactive; active traits are visible and provide effects, whereas inactive traits are hidden. The genetic versions of {{iconify|Melancholic}}, {{iconify|Lunatic}} and {{iconify|Possessed}} are [[#List of congenital traits|always inherited inactively]] and become active later in life:<ref>{{cite file|game\events\trait_specific_events\trait_specific_events.txt}}, <code>trait_specific.0500</code></ref>
{| class="wikitable"
! rowspan=2 | Trait
! colspan=2 | Activation time (after birth)
|-
! Days
! Years<ref>All years in Crusader Kings III last 365 days.</ref>
|-
| {{iconify|Melancholic}}
| 3,650-5,000
| Between 10 years and 13 years, 9 months, 12 days
|-
| {{iconify|Lunatic}}
| 5,840-10,950
| Between 16 years and 30 years
|-
| {{iconify|Possessed}}
| 3,650-7,300
| Between 10 years and 20 years
|}


==== Chance of active inheritance ====
The chances of inheriting a congenital trait as an active trait is based on what version (active or inactive) the parents have:<ref name=Defines>{{cite file|common\defines\00_defines.txt}}, <code>NChildbirth</code></ref>
{| class="wikitable"
{| class="wikitable"
! {{diagonal split header|Father|Mother}}
! {{diagonal split header|Father|Mother}}
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|}
|}


=== Inactive ===
==== Chance of inactive inheritance ====
If that check fails the chances of inheriting inactively is calculated:<ref name=Defines />
If the child does not inherit actively, there is a chance that they will inherit the trait as an inactive trait instead:<ref name=Defines />
 
{| class="wikitable"
{| class="wikitable"
! {{diagonal split header|Father|Mother}}
! {{diagonal split header|Father|Mother}}
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| 0.5
| 0.5
| -
| -
|
|-
|-
| {{iconify|Wheezing}}
| {{iconify|Wheezing}}
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Inbreeding is the process of two related characters having children together. For these purposes, related characters are those who share a [[#Common ancestors|common ancestor]]. Such children can be born with negative congenital traits even if neither parent has them. However, there is a small chance for the child to gain the [[File:Trait pure blooded.png|24px]] Pure-blooded trait instead. The chance to gain inbreeding traits is low in the first generation, but each successive generation has a higher chance. Related characters are also harder to use the Seduction Scheme on unless either the target character's Faith accepts it or if the seducer has the Subtle Desire perk.
Inbreeding is the process of two related characters having children together. For these purposes, related characters are those who share a [[#Common ancestors|common ancestor]]. Such children can be born with negative congenital traits even if neither parent has them. However, there is a small chance for the child to gain the [[File:Trait pure blooded.png|24px]] Pure-blooded trait instead. The chance to gain inbreeding traits is low in the first generation, but each successive generation has a higher chance. Related characters are also harder to use the Seduction Scheme on unless either the target character's Faith accepts it or if the seducer has the Subtle Desire perk.


=== Common ancestors ===
=== Chance of inbreeding ===
[[File:Chance of inbreeding.png|500px|thumb|right|A line graph showing chance of inbreeding based on common ancestors.]]
The chance of a child being considered inbred can be found from the product of the following:<ref>"The final chance [for inbreeding] in percent is given by the number of common ancestors X corresponding level factor X inbreeding chance modifier" Developer comments in {{cite file|game\common\defines\00_defines.txt}}.</ref>
* Number of [[#Common ancestors|common ancestors]]
* [[#Inbreeding factor|Inbreeding factor]] based on number of common ancestors
* Inbreeding chance modifier. Currently, only the {{iconify|Pure-blooded}} trait [[#Effect of Pure-blooded on inbreeding|provides such an effect]].
 
==== Common ancestors ====
The more common ancestors two parents have within four generations (up to their great-great grandparents, and including themselves), the more likely their children will be inbred.<ref>{{cite file|game\common\defines\00_defines.txt}}, <code>NChildbirth|INBREEDING_ANCESTOR_GENERATIONS = 4</code></ref> Some potential incestuous marriages are noted below. The value provided for common ancestors assumes that ancestors were otherwise non-incestuous and monogamous. Cousins are not removed. Additionally, the value is relative to the breeding couple.
The more common ancestors two parents have within four generations (up to their great-great grandparents, and including themselves), the more likely their children will be inbred.<ref>{{cite file|game\common\defines\00_defines.txt}}, <code>NChildbirth|INBREEDING_ANCESTOR_GENERATIONS = 4</code></ref> Some potential incestuous marriages are noted below. The value provided for common ancestors assumes that ancestors were otherwise non-incestuous and monogamous. Cousins are not removed. Additionally, the value is relative to the breeding couple.
{| class="wikitable sortable"
{| class="wikitable sortable"
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| Third cousins share one set of great-great grandparents.
| Third cousins share one set of great-great grandparents.
|}
|}
=== Chance of inbreeding ===
[[File:Chance of inbreeding.png|500px|thumb|right|A line graph showing chance of inbreeding based on common ancestors.]]
The chance of a child being considered inbred can be found from the product of the following:<ref>"The final chance [for inbreeding] in percent is given by the number of common ancestors X corresponding level factor X inbreeding chance modifier" Developer comments in {{cite file|game\common\defines\00_defines.txt}}.</ref>
* Number of [[#Common ancestors|common ancestors]]
* [[#Inbreeding factor|Inbreeding factor]] based on number of common ancestors
* Inbreeding chance modifier. Currently, only the {{iconify|Pure-blooded}} trait [[#Effect of Pure-blooded on inbreeding|provides such an effect]].


==== Inbreeding factor ====
==== Inbreeding factor ====
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|}
|}


=== Chance of gaining the Pure-blooded trait ===
==== Effect of Pure-blooded on inbreeding ====
The Pure-blooded trait may be [[##List_of_other_inherited_traits|inherited from one's parents]]. Otherwise, it may be gained naturally. Similar to the chance of inbreeding, the chance of gaining the {{iconify|Pure-blooded}} trait naturally is based on the number of common ancestors, multiplied by the corresponding level factor for that amount of common ancestors:<ref name=Defines />
The Pure-blooded trait provides {{green| −50%}} chance of inbreeding per parent. If two parents have the Pure-blooded trait, this effect combines to no chance of gaining traits due to inbreeding. Note that this excepts the chance of gaining the Pure-blooded trait [[#Chance of gaining the Pure-blooded trait|naturally]], as well as the inheritance of such traits [[#List of congenital traits|via parents]]. It is unknown whether the Pure-blooded trait has an effect on gaining the Inbred trait.<ref name=TalkPagePureBloodedEffect/>
{| class="wikitable"
! Common ancestors
! Factor
! Final chance
|-
| 0-19
| 0
| 0%
|-
| 20-21
| 0.15
| Between 3% and 3.15%
|-
| 22-30
| 0.3
| Between 6.6% and 9%
|}
As a result, parents must have at least 20 common ancestors for a child to gain the {{iconify|Pure-blooded}} trait naturally. This does ''not'' apply to inheriting it from parents.


=== Traits gained from inbreeding ===
=== Traits gained from inbreeding ===
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|}
|}


=== Effect of Pure-blooded on inbreeding ===
==== Chance of gaining the Pure-blooded trait ====
The Pure-blooded trait provides {{green| −50%}} chance of inbreeding per parent. If two parents have the Pure-blooded trait, this effect combines to no chance of gaining traits due to inbreeding. Note that this excepts the chance of gaining the Pure-blooded trait [[#Chance of gaining the Pure-blooded trait|naturally]], as well as the inheritance of such traits [[#List of congenital traits|via parents]]. It is unknown whether the Pure-blooded trait has an effect on gaining the Inbred trait.<ref name=TalkPagePureBloodedEffect/>
The Pure-blooded trait may be [[#List of other inherited traits|inherited from one's parents]]. Otherwise, it may be gained naturally. Similar to the chance of inbreeding, the chance of gaining the {{iconify|Pure-blooded}} trait naturally is based on the number of common ancestors, multiplied by the corresponding level factor for that amount of common ancestors:<ref name=Defines />
{| class="wikitable"
! Common ancestors
! Factor
! Final chance
|-
| 0-19
| 0
| 0%
|-
| 20-21
| 0.15
| Between 3% and 3.15%
|-
| 22-30
| 0.3
| Between 6.6% and 9%
|}
As a result, parents must have at least 20 common ancestors for a child to gain the {{iconify|Pure-blooded}} trait naturally. This does ''not'' apply to inheriting it from parents.


== See also ==
== See also ==

2020年10月29日 (四) 12:23的版本

Breeding is the production of offspring. In Crusader Kings III, this also includes intentional strategies that aim to increase the likelihood of passing down certain congenital traits. This often involves marrying characters with any of the desired traits, and purposely disinheriting heirs that did not inherit the desired trait(s).

Trait inheritance

Congenital (also known as genetic) traits can be inherited by a character's offspring. Although genetic traits must be visible (active) to provide stat bonuses and other effects, a character may also carry recessive (inactive) traits which are invisible, yet can still be inherited by one's children.[1]

There are some traits that are inherited by children, but do not use the active/inactive inheritance mechanic. In the context of this section, the term congenital trait excludes such traits. It also does not include traits that are non-genetic, yet inheritable.

Active and inactive traits

A congenital trait may be either active or inactive; active traits are visible and provide effects, whereas inactive traits are hidden. The genetic versions of  Melancholic,  Lunatic and  Possessed are always inherited inactively and become active later in life:[2]

Trait Activation time (after birth)
Days Years[3]
 Melancholic 3,650-5,000 Between 10 years and 13 years, 9 months, 12 days
 Lunatic 5,840-10,950 Between 16 years and 30 years
 Possessed 3,650-7,300 Between 10 years and 20 years

Chance of active inheritance

The chances of inheriting a congenital trait as an active trait is based on what version (active or inactive) the parents have:[4]

Mother
Father
 None Inactive Active
None 0% 2% 25%
Inactive 2% 10% 50%
Active 25% 50% 80%

Chance of inactive inheritance

If the child does not inherit actively, there is a chance that they will inherit the trait as an inactive trait instead:[4]

Mother
Father
 None Inactive Active
None 0% 25% 75%
Inactive 25% 50% 100%
Active 75% 100% 150%

General logic for trait with tiers inheritance

  1. Start from highest trait
  2. Calculate active chance. Lower tiers ( including inactive ) count as inactive of the tier. Each level down beyond the first multiplies chance by a define
  3. If active, use it; DONE
  4. Otherwise, go down a tier, if inactive pretend 1 more parent has that tier active, otherwise 1 more parent has it inactive.GOTO 2

When trying to inherit a tiered genetic trait, and the other person has one of lower tier, we pretend that means they've got the higher tier one recessively, and reduce the chance of inheritance by 20% per tier further down than 1 the other parent's trait is.

When going down a tier, add 40%.[4]

List of congenital traits

The table below contains all genetic traits that use the inheritance mechanism as described above.[5][6] This list does not contain traits such as  Sayyid, which can be inherited from a character's non-biological parent (in the case of secret bastards), or  Inbred which uses a custom inheritance chance. The natural prevalence column denotes the likelihood of any character being born with the trait if it is not inherited from their parents. For every trait with natural prevalence, the same value can be assumed for random prevalence (i.e. for generated characters).[5] Note that some traits cannot be inherited at the same time since they are incompatible; such traits are indicated if they belong in the same group.

Trait Natural prevalence (%) Group Notes
 Melancholic (genetic variant) 0.5 - If inherited on birth, it is initially hidden.[7]
 Lunatic (genetic variant) 0.5 - 如果在出生时被遗传，最开始将是隐藏（未激活）的。
 Possessed (genetic variant) 0.5 - 如果在出生时被遗传，最开始将是隐藏（未激活）的。
 Homely 0.5 Beauty
 Ugly 0.25 Beauty
 Hideous 0.15 Beauty
 Comely 0.5 Beauty
 Pretty / Handsome 0.25 Beauty
 Beautiful 0.15 Beauty
 Slow 0.5 Intelligence
 Stupid 0.25 Intelligence
 Imbecile 0.05 Intelligence
 Quick 0.5 Intelligence
 Intelligent 0.25 Intelligence
 Genius 0.05 Intelligence
 Delicate 0.5 Physique
 Frail 0.25 Physique
 Feeble 0.15 Physique
 Hale 0.5 Physique
 Robust 0.25 Physique
 Amazonian / Herculean 0.15 Physique
 Fecund 0 at birth[8], unknown for generation Fertility
 Club-footed 0.5 - 也可以通过近亲繁殖获得。
 Hunchbacked 0.5 - 也可以通过近亲繁殖获得。
 Lisping 0.5 -
 Stuttering 0.5 -
 Dwarf 0.5 Stature 也可以通过近亲繁殖获得。
 Giant 0.5 Stature 也可以通过近亲繁殖获得。
 Spindly 0.5 Physique (incompatible with good traits) 也可以通过近亲繁殖获得。
 Scaly 0.5 - 也可以通过近亲繁殖获得。
 Albino 0.5 -
 Wheezing 0.5 - 也可以通过近亲繁殖获得。
 Bleeder 0.5 - 也可以通过近亲繁殖获得。
 Barren / Sterile 0.5 Fertility Also gained via inbreeding.

List of other inherited traits

The following list contains all other traits that use a separate inheritance mechanic. For entries without a chance to inherit value for both parents, assume the value for single parent.

Trait Chance to inherit (%) Notes
Single parent Both parents
 Great Pox 10 -
 Lover's Pox 10 -
 Pure-blooded 15 75 Gained initially through inbreeding.
 Inbred 15 - Gained initially through inbreeding.
 Sayyid 100 - Only inherited from apparent father.
 Saoshyant /  Saoshyant Descendant 100 - When parent has  Saoshyant,  Saoshyant Descendant is inherited instead.[9]
 Paragon /  Consecrated Blood 100 - When parent has  Paragon,  Consecrated Blood is inherited instead.
 The Savior /  Divine Blood 100 - When parent has  The Savior,  Divine Blood is inherited instead.

Inbreeding

Inbreeding is the process of two related characters having children together. For these purposes, related characters are those who share a common ancestor. Such children can be born with negative congenital traits even if neither parent has them. However, there is a small chance for the child to gain the Trait pure blooded.png Pure-blooded trait instead. The chance to gain inbreeding traits is low in the first generation, but each successive generation has a higher chance. Related characters are also harder to use the Seduction Scheme on unless either the target character's Faith accepts it or if the seducer has the Subtle Desire perk.

Chance of inbreeding

A line graph showing chance of inbreeding based on common ancestors.

The chance of a child being considered inbred can be found from the product of the following:[10]

Common ancestors

The more common ancestors two parents have within four generations (up to their great-great grandparents, and including themselves), the more likely their children will be inbred.[11] Some potential incestuous marriages are noted below. The value provided for common ancestors assumes that ancestors were otherwise non-incestuous and monogamous. Cousins are not removed. Additionally, the value is relative to the breeding couple.

Relation Common ancestors Explanation
Full siblings 30 (maximum possible) By definition, (full) siblings share parents, and thus by extension all other ancestors. The maximum amount of ancestors from n generations can be found from [math]\displaystyle{ \text{Max Ancestors} = 2 ^ {n + 1} - 2 }[/math], thus being 30 from 4 generations. Or, written out, full siblings share both parents (2), two sets of grandparents (4), four sets of great grandparents (8) and eight sets of great-great grandparents (16).
Parent-child 15 In the case of a partner being the other partner's ancestor, they are counted as a common ancestor.[12] As a result, the common ancestors are the following (perspective is child/parent): parent/self (1), one set of grandparents/both parents (2), two sets of great-grandparents/standard grandparents (4), four sets of great-great grandparents/great grandparents (8). Note that the parent's great-great grandparents are the child's 3×-great grandparents, and are therefore not counted.
Half siblings 15 They share one parent, and therefore share only half of the maximum amount of ancestors. Alternatively, they share one parent (1), one set of grandparents (2), two sets of great grandparents (4) and four sets of great-great grandparents (8).
First cousins 14 First cousins share grandparents (2), two sets of great grandparents (4) and four sets of great-great grandparents (8).
Uncle-niece/aunt-nephew 14 Similar to first cousins, but rather than sharing grandparents, the nibling's grandparents are the uncle/aunt's parents. Note that since the uncle/aunt's great-great grandparents are the nibling's 3×-great grandparents, who are 5 generations away from the nibling's perspective, they are not counted.
Second cousins 6 Second cousins share one set of great grandparents (2) and two sets of great-great grandparents (4).
Third cousins 2 Third cousins share one set of great-great grandparents.

Inbreeding factor

The inbreeding factor for a given amount of common ancestors can be found through the following:[4]

Common ancestors Factor Chance before modifiers
0-14 0.33 Between 0% and 4.62%
15-16 0.75 Between 11.25% and 12%
17-19 1 Between 17% and 19%
20-21 2 Between 40% and 42%
22-30 3 Between 66% and 90%

Effect of Pure-blooded on inbreeding

The Pure-blooded trait provides −50% chance of inbreeding per parent. If two parents have the Pure-blooded trait, this effect combines to no chance of gaining traits due to inbreeding. Note that this excepts the chance of gaining the Pure-blooded trait naturally, as well as the inheritance of such traits via parents. It is unknown whether the Pure-blooded trait has an effect on gaining the Inbred trait.[7]

Traits gained from inbreeding

The following traits may be gained from inbreeding. With the exception of  Inbred and  Pure-blooded, traits seem as though they appear equally likely.[7]

Trait Notes
 Barren / Sterile
 Scaly
 Club-footed
 Wheezing
 Spindly
 Giant
 Hunchbacked
 Bleeder
 Dwarf
 Pure-blooded Chance is based on amount of common ancestors.
 Inbred Exact mechanic unknown. However, the following has been observed:[7]
  • Highly inbred couples without any of the traits in this table had no children with the  Inbred trait.
  • Similar to above, but with the  Pure-blooded trait, had similar results.

Chance of gaining the Pure-blooded trait

The Pure-blooded trait may be inherited from one's parents. Otherwise, it may be gained naturally. Similar to the chance of inbreeding, the chance of gaining the  Pure-blooded trait naturally is based on the number of common ancestors, multiplied by the corresponding level factor for that amount of common ancestors:[4]

Common ancestors Factor Final chance
0-19 0 0%
20-21 0.15 Between 3% and 3.15%
22-30 0.3 Between 6.6% and 9%

As a result, parents must have at least 20 common ancestors for a child to gain the  Pure-blooded trait naturally. This does not apply to inheriting it from parents.

See also

References

  1. ↑ "[Genetic traits are] visible, though characters can also carry recessive traits... those are not visible, but can be inherited by their offspring!" rageair's reply in CK3 Dev Diary #7 - Characters & Portraits thread
  2. ↑ game\events\trait_specific_events\trait_specific_events.txt, trait_specific.0500
  3. ↑ All years in Crusader Kings III last 365 days.
  4. ↑ 4.0 4.1 4.2 4.3 4.4 common\defines\00_defines.txt, NChildbirth
  5. ↑ 5.0 5.1 common\traits\00_traits.txt
  6. ↑ "[If genetic = yes, the trait's] inheritance will follow the following rules: The trait can be inactive. Children can inherit the trait from both active and inactive parent traits. [...] An active trait is inherited with 100% chance, an inactive trait with a 50% chance. If the trait is successfully inherited from both parents, it becomes active. [...] If it's inherited only from one parent, it's inactive." Developer comments in common\traits\_traits.info
  7. ↑ 7.0 7.1 7.2 7.3 Pure-blooded effect on inbreeding on talk page
  8. ↑ Natural prevalence of Fecund on talk page
  9. ↑ events\decisions_events\major_decisions_events.txt, major_decisions.0101
  10. ↑ "The final chance [for inbreeding] in percent is given by the number of common ancestors X corresponding level factor X inbreeding chance modifier" Developer comments in game\common\defines\00_defines.txt.
  11. ↑ game\common\defines\00_defines.txt, NChildbirth|INBREEDING_ANCESTOR_GENERATIONS = 4
  12. ↑ The fact that the parents themselves are included in the common ancestor count is implied in the wording of developer comments found at game\common\defines\00_defines.txt (emphasis added): "How many generations are checked for common ancestors of the both parents (including the parents) for the purposes of getting the inbreeding trait and the pure-blooded trait"