Question

Genes a and b are linked with 4% recombination. True breeding AB is crossed with true breeding ab, and F1 is testcrossed. What is the frequency of getting Aabb progeny? What about AaBb?

Answer 1

So, the total pouplation (100%) = % of parental categories + % of recombianant categories.

So, the % of parental categories = 100% - % of recombianant categories.
As the % of recombianant categories is 4%, the
the % of parental categories = 100% - 4% = 96%.

As each category contains two genotypes, individual genotype percentage =
% of each recombianant categorie is 4/2 = 2% and
% of each parental categorie is 96/2 = 48%.

As Aabb is recombinant progeny, the freequency is 2% and

as AaBb is the parental progeny, the freequency is 48%.

Find the below image for explanation...