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You just bought two black guinea pigs, one male and one female, of the same genotype from the pet store that are known to be heterozygous (Bb). You also know that black fur (BB) is dominant over white fur (bb) and that a lethal recessive allele is located only 1 m.u. away from the recessive b allele, and your animals are both heterozygous for this gene also.
-What is the probability of finding a white individual among the progeny if you cross these two animals?
A) 0.25
B) 0.0025
C) 0.000025
D) 0.005
E) 0.495

Question

Quizplus · Accepted Answer

The probability of a white individual (bb) is 0.25. However, due to the lethal recessive allele closely linked to b, recombination is rare (1% or 0.01). Thus, the probability of a viable white individual is 0.25 * 0.01 = 0.0025.

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