Suppose you have monohybrid pea plants in your garden and find that they produce round seed to wrinkled seeds in the ratio of 3:1. If the allele are designated (R & r) respectively, what is the probable genotypes of the round seeds which were produced

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03-12-2018
Biology

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Suppose you have monohybrid pea plants in your garden and find that they produce round seed to wrinkled seeds in the ratio of 3:1. If the allele are designated (R & r) respectively, what is the probable genotypes of the round seeds which were produced

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nplawyer74 nplawyer74 · Answer 1 · 2018-12-03T17:32:56+01:00

In a monohybrid cross, a 3:1 ratio indicates that both parents are heterozygous (Rr). Since wrinkled is the recessive trait in this case, a seed must be homozygous for the recessive wrinkled allele (rr, with a probability off 25%). Since round is dominant to wrinkled in this case, the round offspring have two options for their genotypes; heterozygous like the parents (Rr, with a probability of 50%) or homozygous for the dominant round allele (RR, with a probability of 25%).