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育种：修订间差异

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== Inbreeding ==
== Inbreeding ==
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 ===
=== Common ancestors ===
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|-
|-
! Relation
! Relation
! Common ancestors
! data-sort-type=number | Common ancestors
! Explanation
! Explanation
|-
|-
| Full siblings
| Full siblings
| 30
| 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>\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).
| 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>\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).
|-
|-
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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 ===
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 provides such an effect, reducing the chance of inbreeding by {{green|−50%}}.
==== Inbreeding factor ====
The inbreeding factor for a given amount of common ancestors can be found through the following:<ref name=Defines />
{| class="wikitable"
! 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%
|}
=== Chance of gaining the Pure-blooded trait ===
Similar to the chance of inbreeding, the chance of gaining the {{iconify|Pure-blooded}} trait 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.


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

2020年10月26日 (一) 10:49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 traits

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.[1]

Active

First the chances of acquiring the trait as an active trait is checked as a function of the parents:[2]

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

Inactive

If that check fails the chances of inheriting inactively is calculated:[2]

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%.[2]

List of congenital traits

The table below contains all genetic traits that use the inheritance mechanism as described above.[3][4] 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).[3] 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
 Melancholic (genetic variant) 0.5 -
 Lunatic (genetic variant) 0.5 -
 Possessed (genetic variant) 0.5 -
 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 Unknown Fertility
 Clubfooted 0.5 -
 Hunchbacked 0.5 -
 Lisping 0.5 -
 Stuttering 0.5 -
 Dwarf 0.5 Stature
 Giant 0.5 Stature
 Spindly 0.5 Physique (incompatible with good traits)
 Scaly 0.5 -
 Albino 0.5 -
 Wheezing 0.5 -
 Bleeder 0.5 -
 Barren / Sterile 0.5 Fertility

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.[5]
 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.

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.[6] 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.[7] 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.

Chance of inbreeding

The chance of a child being considered inbred can be found from the product of the following:[8]

  • Number of common ancestors
  • Inbreeding factor based on number of common ancestors
  • Inbreeding chance modifier. Currently, only the  Pure-blooded trait provides such an effect, reducing the chance of inbreeding by −50%.

Inbreeding factor

The inbreeding factor for a given amount of common ancestors can be found through the following:[2]

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%

Chance of gaining the Pure-blooded trait

Similar to the chance of inbreeding, the chance of gaining the  Pure-blooded trait is based on the number of common ancestors, multiplied by the corresponding level factor for that amount of common ancestors:[2]

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.

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. ↑ 2.0 2.1 2.2 2.3 2.4 common\defines\00_defines.txt, NChildbirth
  3. ↑ 3.0 3.1 common\traits\00_traits.txt
  4. ↑ "[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
  5. ↑ events\decisions_events\major_decisions_events.txt, major_decisions.0101
  6. ↑ game\common\defines\00_defines.txt, NChildbirth|INBREEDING_ANCESTOR_GENERATIONS = 4
  7. ↑ 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"
  8. ↑ "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.