Dug out an old text book... If only: https://pic8.co/sh/6AA7RI.jpg
Now, lethal alleles I don't remember. Wonder why two dominant genes are deadly, instead of just manifesting the dominant trait and are all double dominants lethal, or just some? Intriguing.
Basically the observable trait is actually tied to a developmental trait. They can be dominant or recessive, or more complicated, fetal development or later. But always development detrimental.
always development detrimental
TIL. Still wonder why that is.
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