Eugenics Mod v1.3
 
Design philosophy: In regular Crusader Kings 2, traits are passed down based purely on one parent having the trait in most scenarios; and it didn't really make sense for the trait to not be more likely if both parents had it.
The aim of the mod is to be both logical and balanced. You shouldn't be breeding strong, attractive geniuses regularly if at all.


Traits
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Attractive (Fair) - +2 diplomacy, +20 attraction opinion, +5 vasasl opinion, and +10% fertility.

Ugly - See above but change everything to negative.

Attractive/Ugly -  Inherit chances are 30% with one parent and 60% with both (down from 32%/70%).


Strong - No longer gives +1 diplomacy or +10% fertility (moved to Attractive).

Weak - -2 Martial (down from -1) and no longer lowers fertility.

Strong/Weak - Inherit chances are 25% with one parent and 50% with both (down from 30%/65%).


Quick/Slow - Inherit chances are 22% with one parent and 40% with both (down from 25%/55%).


Genius/Imbecile - Inherit chance is 25% with both parents (down from 35% - 15% base with one parent unchanged).


Inbred - Inherit chance is 75% with both parents (down from 80%).


Clubfooted/Harelip - Inherit chances are 25% with one parent and 50% with both.


Stutter/Lisp/Hunchback - No longer inheritable since these are much more learned than genetic (but what about left-handed?).


Giant (new!) - Inherit chances are 5% with one parent and 15% with both (5% unchanged from vanilla).

Left-handed (new!) - Inherit chances are 25% with one parent and 40% with both (25% unchanged from vanilla).

Freckles (new!) - This one is handled via script, so I'm just going to let it do its thing for now.


You'll notice that I lowered most of the rates to inherit on traits compared to version 1.2. I did this because it should be a lot easier to get the heir you want
in Holy Fury due to Meritocracy, Elective being more transparent, Eldership, and the new special Electives for the Roman Empires. 80% felt a little overkill on inbred,
but maybe it's correct to have it high for all the *cough* "Divine Marriages" that will be taking place.



Ruler Designer
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Quick - +25 years (up from 20 in 1.2).

Genius - +40 years (same as 1.2).

Attractive - +12 years (same as 1.2).

Strong - +15 years (same as 1.2).

Left-handed - +7 years.


A lot of these really just made no sense comparatively. Made Quick a little more expensive since it was slightly better than half as good as Genius.