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A human male produces sperms with the genotypes AB, Ab, aB, and ab pertaining to two diallelic characters in equal proportions. What is the corresponding genotype of this person?
A
AaBB
B
AABb
C
AABB
D
AaBb
Detailed Solution
The four kinds of sperms contain both A and a, and both B and b, so the person must be heterozygous for both genes.
A person of genotype AaBb forms gametes by the independent assortment of the two pairs of alleles.
A can go with B or b, and a can go with B or b, giving four types of gametes: AB, Ab, aB and ab, in equal proportions (25 percent each).
AaBB would produce only two types of gametes, AB and aB.
AABb would produce only two types, AB and Ab.
AABB would produce only one type, AB.
So the genotype of the person is AaBb.
A person of genotype AaBb forms gametes by the independent assortment of the two pairs of alleles.
A can go with B or b, and a can go with B or b, giving four types of gametes: AB, Ab, aB and ab, in equal proportions (25 percent each).
AaBB would produce only two types of gametes, AB and aB.
AABb would produce only two types, AB and Ab.
AABB would produce only one type, AB.
So the genotype of the person is AaBb.