Problem 9: Homozygous offspring of a dihybrid cross, again.
Tutorial to help answer the question
In a dihybrid cross, SsYy x SsYy, what fraction of the offspring will be homozygous for both traits?
There are 4 out of 16 possible combinations of gametes from an SsYy x SsYy cross with the genotype of SsYy. We would therefore predict that 4/16 (or 1/4) of the offspring of the cross would be homozygous for both traits.
Note that there is a different phenotype for each of the 4 different combinations of alleles.
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