Schultz

Biology

30 September, 19:25

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 femaleB) 1:2 male to femaleC) 1:1 male to femaleD) 3:1 male to female