In Birds,sex Is Determined by a ZW Chromosome Scheme That

question 30

Multiple Choice

In birds,sex is determined by a ZW chromosome scheme that is much like the typical XY scheme seen in humans and many other organisms,except that the system is reversed:
Males are ZZ (similar to XX in humans) and females are ZW (similar to XY in humans) .A lethal recessive allele that causes death of the embryo occurs on the Z chromosome in pigeons.What would be the sex ratio in the offspring of a cross between a male heterozygous for the lethal allele and a normal female?

• A)1:1 male to female
• B)4:1 male to female
• C)3:1 male to female
• D)1:2 male to female
• E)2:1 male to female

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