Respuesta :
Answer:
The parents are probably both phenotypically round-seeded with genotypes (Rr) each.
Explanation:
According to the question, a monohybrid cross involving a single gene coding for seed shape in pea plants is the case here. The allele for round seeds is R while allele for wrinkled seeds is r. The "R" allele is dominant over the "r" allele i.e. the phenotypic expression of r will be masked by R in a heterozygous state.
In order to get a ratio 3:1 of round seeds to wrinkled seeds offsprings, the parents will probably both have an Rr genotype, which is phenotypically round-seeded considering that round seeds (R) is dominant over wrinked seeds (r).
As seen in the punnet square attached as an image, four possible offsprings will be produced from a cross between parents Rr × Rr. The possible offsprings will have genotypes: RR, Rr, Rr, and rr.
RR, Rr, Rr are phenotypically round-seeded (3)
rr is phenotypically wrinkled-seeded (1).
Hence, the ratio 3 round seeds : 1 wrinkled seeds will be probably produced by parents with round seeds (Rr).