Suppose the map for a particular human chromosome interval is:
a——1 m.u.——b--1 m.u.——c--1 m.u.——d——1 m.u.——e——1 m.u.——f
In a man heterozygous for all six genes, what fraction of his sperm would be recombinant in the a-f interval?
A)0%
B)1%
C)2.5%
D)5%
E)cannot be determined

Question

Suppose the map for a particular human chromosome interval is:
 a——1 m.u.——b--1 m.u.——c--1 m.u.——d——1 m.u.——e——1 m.u.——f
In a man heterozygous for all six genes, what fraction of his sperm would be recombinant in the a-f interval?
A)0%
B)1%
C)2.5%
D)5%
E)cannot be determined

Quizplus · Accepted Answer

The total map distance between genes a and f is 5 m.u. (1 m.u. between each pair of adjacent genes). Since 1 m.u. corresponds to a 1% recombination frequency, the total recombination frequency in the a-f interval is 5%. Therefore, 5% of the sperm will be recombinant in the a-f interval.

Suppose the Map for a Particular Human Chromosome Interval Is