Suppose you have monohybrid pea plants in your garden and find that they produce round seeds to wrinkled seeds in the ratio of 3: 1 if the alleles are designated r and r, respectively, what are the probable genotypes of the wrinkled seeds produced by your plants

The answer is rr. In a monohybrid cross, the phenotypic ratio is 3:1 for dominant trait to recessive trait. Since the ration is 3:1 for round seeds to wrinkled seeds, we can conclude that round seed is the dominant trait. Let R be a dominant allele for round seed and r be a recessive allele for wrinkled seed. The genotypes will be: RR (dominant homozygote with round seeds), Rr (heterozygote with round seeds), and rr (recessive homozygote with wrinkled seeds. Thus, only genotype rr is the genotype of the wrinkled seeds.

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