In cats, yellow fur is due to the allele “ B ”, and black fur to the allele “ b
ID: 58789 • Letter: I
Question
In cats, yellow fur is due to the allele “B”, and black fur to the allele “b”; these alleles are sex-linked. The heterozygous condition results in tortoise-shell coloration. What kinds of offspring (sex and color) are expected from a cross of a black male with a tortoise-shell female?
2 black females, yellow male, tortoise-shell male
2 tortoise-shell females, 2 black males
Black female, yellow female, tortoise-shell male, black male
Black female, tortoise-shell female, 2 yellow males
Black female, tortoise-shell female, yellow male, black male
A.2 black females, yellow male, tortoise-shell male
B.2 tortoise-shell females, 2 black males
C.Black female, yellow female, tortoise-shell male, black male
D.Black female, tortoise-shell female, 2 yellow males
E.Black female, tortoise-shell female, yellow male, black male
Explanation / Answer
E. Black female, tortoise-shell female, yellow male, black male
The genotype of black male is, XbY and the genotype of tortoice shell female is XBXb, cross between these two will have the offspring with the following genotypes and phenotypes.
XbY, XBXb = XbXB (tortoice-shell female), XbXb (black female), YXB (yellow male), YXb (black male)
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