Genes A and B are linked on the same chromosome The recombin

Genes A and B are linked on the same chromosome. The recombination frequency between the two genes is r=0.4. Given this cross between two individuals: AB/ab x aB/Ab, what is the probability of the cross giving progeny of the genotype AB/AB?

Solution

if r = 0.4, this indicates that the genes are linked.

AB/ab X aB/Ab

gametes AB ab aB Ab

Progeny AB/aB : AB/Ab : ab/aB : ab/Ab in the ration of 1:1:1:

So the probabiltiy of the cross giving progeny of genotype AB/AB is less or this recombinant genotype is not possible.

If the genes are not linked, that is have a recombination frequency of 0.5. Then the probability of the cross giving a progeny of genotype AB/AB is 1/16 that is 0.0625