Question

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 wrinkled seeds which were produced?
Rr only
RR & Rr
rr only
RR & rr
RR only

Answer 1

Step-by-step explanation:

In a monohybrid cross involving pea plants with the alleles R (round) and r (wrinkled), if the ratio of round seeds to wrinkled seeds in the offspring is 3:1, it suggests that the parents must be heterozygous (Rr) for this trait. This is because the round (RR) and wrinkled (rr) genotypes would produce a 1:1 ratio of round to wrinkled seeds, not the 3:1 ratio you observed.

So, the probable genotypes of the wrinkled seeds are Rr.