Recombination
between unlinked markers
Where the
loci A and B are unlinked on separate
chromosome pairs, the cross between parental AABB x
aabb produces the double heterozygote F1
AaBb. When backcrossed to an aabb tester,
the F1 produces AB, Ab,
aB, and ab gametes in equal ratios, and the
recombinant Ab and aB gametes are 50% of
the total