Consider a gene with four alleles A₁, A₂, A₃, and A₄. If the cross A₁A₂ × A₃A₄ yields two offspring, what is the probability that both of them have the same genotype? A)1/8 B)1/4 C)1/3 D)1/2 E)3/4

Question

Quizplus · Accepted Answer

The possible genotypes of the offspring are A₁A₃, A₁A₄, A₂A₃, and A₂A₄. The probability that two offspring have the same genotype is the probability of choosing one of these four possibilities twice, which is 1/4 or 25%. Therefore, the answer is B.

Consider a Gene with Four Alleles A1, A2, A3, and A4

Consider a Gene with Four Alleles A₁, A₂, A₃, and A₄