1. Two abnormal traits due to recessive mutations at genes R and T, respectively were found to be 20 map units apart in a linkage group of corn. If one could not do any more test crosses in this organism, but had to rely on selfings of dihybrid F1 progeny, indicate the classes and proportions of F2 progeny that would be expected if:
a) genes R and T were in the coupling phase in the F1?
b) genes R and T were in the repulsion phase in the F1?, i.e. from Rt/Rt x rT/rT
Start by giving, in both instances, the parental genotype, F1 genotypes and F1 gamete classes and proportion. Then give the F2 phenotypic classes and proportions. Summarize them.
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