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Author Question: In birds, sex is determined by a ZW chromosome scheme. Males are ZZ and females (Read 821 times)

Hungry!

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on: Jun 21, 2013
In birds, sex is determined by a ZW chromosome scheme. Males are ZZ and females are ZW. A recessive lethal allele that causes death of the embryo is sometimes present on the Z chromosome in pigeons. What would be the sex ratio in the offspring of a cross between a male that is heterozygous for the lethal allele and a normal female?
A) 2:1 male to female
B) 1:2 male to female
C) 1:1 male to female
D) 4:3 male to female
E) 3:1 male to female


camila

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Reply #1 on: Jun 22, 2013
100% it's A, don't forget to gimmi a thumbs up :D


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Hungry!

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Reply #2 on: Aug 13, 2013
Thanks so much, you were right on.


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