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Two pea plants are crossed. 50% percent of the offspring have seeds with a wrinkled appearance (caused by the presence of a homozygous recessive gene). What were the genotypes of the parents?Group of answer choicesRR x rrRr x rrRr x RrRR x Rr

Question

Two pea plants are crossed. 50% percent of the offspring have seeds with a wrinkled appearance (caused by the presence of a homozygous recessive gene). What were the genotypes of the parents?Group of answer choicesRR x rrRr x rrRr x RrRR x Rr

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Solution

The genotypes of the parents were Rr x Rr.

Here's why:

  1. The wrinkled appearance in pea plants is caused by a homozygous recessive gene (rr).

  2. If 50% of the offspring have this trait, it means that one of the alleles from each parent must be recessive.

  3. Therefore, each parent must have been heterozygous (Rr) for this trait.

  4. If either parent had been homozygous dominant (RR), none of the offspring would have the wrinkled trait because the dominant allele would always mask the recessive one.

  5. If either parent had been homozygous recessive (rr), all of the offspring would have the wrinkled trait because they would have no dominant allele to mask the recessive one.

  6. Therefore, the only possible combination that would result in 50% of the offspring having the wrinkled trait is if both parents were heterozygous (Rr).

This problem has been solved

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