regius

no, the male was normal and didn't have any B in his background. Male normal x female B always makes all female B and normal looking males.

OK, we're on the same page but here's something I don't understand. How can a B female (defective Z, normal W) make a female baby with the trait? she can only give defective Z and normal W. The father can provide only normal Z. Females are only coming from the father's normal Z and the females normal W. These should look normal. All breedings with a B parent produce only B females, never a normal female.

I breed snakes and work mainly with color and pattern mutations for the pet trade. I’m having difficulty understanding the inheritance of a trait I’m working with. I’ll call that trait “B”. I’m working with a small sample size but I think the following are true: Normal male x B female gives B females and normal males VERY RARELY a B male B male x normal female gives B females never a B male B male x B female gives B females and B males, no normal types (this is based on one breeding) About 60 B animals have been produced, only 5 of these have been males (all produced for B x B breedings) A B male has never produce a B male when bred to a normal female. Snake sex chromosomes: males are ZZ and females ZW Anybody have any ideas?