If two genes are located on the same chromosome and are know

If two genes are located on the same chromosome and are known to be 16 mu (cM) apart. An AABB individual was crossed to an aabb individual to produce AaBb offspring. The AaBb offspring were then test-crossed to aabb individuals. If this cross produces 100 offspring, what are the predicted numbers of offspring with each of the four genotypes: AaBb, Aabb, aaBb, and aabb? Show your cross.

Solution

Answer:

Two genes located on same chromosome is 12 mu apart, so we can expect 12% recombination

for 100 individuals, 12 are recombinant.

AaBb were test crossed with aabb,

Aabb = 6%,    aaBb= 6%,     these are recombinants

AaBb= 44%, aabb= 44,   parents