Which one of the following crosses will have all the offsprings with recessive phenotype in the F_2 generation?

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Correct answer: C. rryy x rryy

For all offspring in the F_2 generation to have a recessive phenotype, the initial parents must be homozygous recessive for all the traits. In the cross rryy × rryy, both parents are homozygous recessive. They will produce only one type of gamete (ry). The F_1 generation will all have the genotype rryy, which expresses the recessive phenotype. When the F_1 individuals are crossed (rryy × rryy) to produce the F_2 generation, all the resulting offspring will again have the genotype rryy. Therefore, all offspring in the F_2 generation will exhibit the recessive phenotype. Answer: rryy x rryy

Which one of the following crosses will have all the offsprings...

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