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28 November, 10:21

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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  1. 28 November, 13:49
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    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%).
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