The R and S genes are linked and 10 map units apart.In the cross R s / r S × r s / r s what fraction of the progeny will be R S / r s?
A)5%
B)10%
C)25%
D)40%
E)45%

Question

Quizplus · Accepted Answer

Since the R and S genes are linked and 10 map units apart, the expected frequency of recombinant offspring is 10%. However, the question asks specifically for the fraction of progeny that will be R S / r s, which is one of the two possible recombinant types. Therefore, we divide the total recombinant percentage (10%) by 2, resulting in 5%.

The R and S Genes Are Linked and 10 Map