An individual has the following genotype Gene loci A and B a

An individual has the following genotype. Gene loci (A) and (B are 15 cM apart. What are the correct frequencies of some of the gametes that can be made by this individual? ab = 25%^, aB = 50% Ab = 7.5%, AB = 42.5% aB = 70%; Ab 15% aB = 15%; Ab = 70% AB = 7.5%, aB = 42.5%

Solution

(E) part ie.AB=7.5%;aB=42.5%

Explanation :-

nonrecombinant gametes would be A_______b, and a_______B and recombinant gametes (due to crossing over rearranging them) would be A_______B and a_______b

The recombination rate between these two genes is 15% - so recombinant gametes would be expected to be 7.5% each, which then leaves the nonrecombinant gametes with a probability of 42.5% each.

A testcross would be to cross this double heterozygote with an individual that is recessive for both traits.

AaBb x aabb

Offsring genotypes

A_______b                 a_______B                 A_______B                 a_______b

_________                  _________                  _________                  _________

a             b                   a             b                   a              b                  a              b

     42.5%                          42.5%                          7.5%                            7.5%