Under EA Standard, only the genetics of the immediate parents are used, which does not allow for genetics Mendel style genetics. In addition to genetic mutation, "Pregnancy \ Inherit Grandparent Blend Chance" defines the chance that a facial section The mutation rate is governed by "Pregnancy \ Blend Mutation Chance" and "Pregnancy \ Blend Mutation Travel". Not much, but hopefully enough to add some variety to each new generation. 
"Advanced Genetics" in alters that approach by adding an increased mutation rate for individual sliders. However, if your town is a closed community, eventually everyone will end up looking the same. This works fine as long as you keep adding new sims with new genetics into the town. 
The method also serves as a way of saying "You inherited your father's nose and your mother's eyes" since that is exactly how the genetics work. This method serves as a means of reducing the chance your child will be a freak of nature, where one slider from the mother does not match up properly with one from the father. For instance: All the Nose sliders are inherited from one parent or the other, never a mixture of both. Facial blends under EA Standard are inherited in sets. After a number of generations, EA Standard's genetics will lead to a homogeneous population where everyone looks the same because there is no mutation at the slider level. This can lead to having a Light Green or a Dark Blue, in addition to the EA Standard geneticsĪ second section called "Pregnancy \ Advanced Genetics" is also available which alters how the various genetic sliders are processed. Then the tone is altered to be a combination of the mother and father. So either Green or Blue in the above example. A skin base is chosen from one of the parents. So if you have a Dark Green mother and a Light Blue father, your children will always be either Dark Green or Light Blue. Under EA Standard, skin tone is inherited from one parent or the other, it is never a combination of the two. 
The main option is "Pregnancy \ Genetic Skin Blending" which alters how the skin tones are inherited.
Extra StoryProgression contains coding to adjust the genetics inheritance performed when a new sim is born in-game.
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