A plant of genotype AB/ab is testcrossed to ab/ab. If the two loci are 10 m.u. apart, what proportion of the progeny will be AB/ab? Please show and explain exactly how the dihybrid cross was done for this problem.© BrainMass Inc. brainmass.com December 15, 2020, 11:10 am ad1c9bdddf
Solution: 24382: Dihybrid cross
When the homozygous dominant genotype has the same phenotype as the heterozygous genotype a test cross is performed to distinguish between them. And a test cross is performed with one parent being always homozygous recessive for all the genes under consideration.
Typically, a dihybrid testcross yields a 1:1:1:1 phenotypic and genotypic ratio among its progeny.
That is - Let's consider AA - Yellow pod, BB -round seed, aa - green pod, ...
The expert examines dihybrid cross for genotypes in plants.