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A pure-breeding double-mutant (apricot, blunt) has aabb genotype, wild-type wasp has genotype AABB. If we cross them:
P: aabb x AABB
F1: all the genotypes would be AaBb
If we ten cross the F1 dihybrids with the double-mutant line:
AaBb x aabb
F2: (table)
The four phenotypes are: 1) wild-type, 2) wild type apricot-short, 3) pale orange-wild type blunt, 4) double-mutant.
The possible haploid genotypes of the gamete it received from the F1 dihybrid: AB, Ab, aB, ab. AB and ab are nonrecombinant (nonREC), like those from parents, while Ab and aB gamets are recombinant (REC) .
