The linkage relationships among the four mouse genes,A,B,C,and D,are shown in the map below.

What proportion of the eggs produced by a female mouse with genotype Ab/aB;CD/cd will carry all the recessive alleles?
A)0.064
B)0.075
C)0.150
D)0.250
E)0.255

Question

The linkage relationships among the four mouse genes,A,B,C,and D,are shown in the map below.

What proportion of the eggs produced by a female mouse with genotype Ab/aB;CD/cd will carry all the recessive alleles?
A)0.064 
B)0.075 
C)0.150 
D)0.250 
E)0.255

Quizplus · Accepted Answer

The correct answer is A because the proportion of eggs carrying all the recessive alleles is 0.064. This can be calculated by multiplying the recombination frequencies between the genes. The recombination frequency between A and B is 30 mu, and the recombination frequency between B and D is 15 mu. Therefore, the recombination frequency between A and D is 30 mu + 15 mu = 45 mu. The proportion of eggs carrying all the recessive alleles is then (1 - 45 mu) = 0.064.

The Linkage Relationships Among the Four Mouse Genes,A,B,C,and D,are Shown