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perta1234 t1_jaxptrm wrote

100% h2 means all trait variation is of genetic origin. Among other things, it does not consider the trait mean value in any way. Anyway, h2 is more quantitative genetics issue. The probability sounds bit more like qualitative genetics question. Sometimes the difference is not very strict.

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Chance_Literature193 OP t1_jayyv1z wrote

Forgive my nativity why wouldn’t probability be quantitative

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perta1234 t1_jb1xh8g wrote

Probability of a qualitative (categorical) trait, no? Or what was the probability you asked, did I miss something? Now if you think of quantitative genetic trait... such as height... one could have probability of being above a given height or such. Disease traits are sometimes polygenic in one way (risk) while the trait can be categorical (sick or not).

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Chance_Literature193 OP t1_jb3h7l0 wrote

Oh I see. You mean Bernoulli trial. Interesting, would call a something discrete qualitative too or just Bernoulli?

When I asking about the conditional probability of trait given parents have trait, I was really thinking of something like height (continuous), but figured find out if such statistic exists in the simpler situation where we consider a yes or no trait.

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perta1234 t1_jb56y5u wrote

That would be maybe more like the expected height given phenotype or genotype of parents, or posterior probability of height in certain range? The oldest quantitative prediction is that progeny is the average of parents. Clearly hides a lot of variation under that simple mean. Maybe check things like estimated breeding value. Might help. Good luck.

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