The genotypes of the P1 monohybrid cross that produce round seeds (R) to wrinkled seeds (r) in the ratio of 3:1 is equal to 3 R_ : 1 rr. It occurs when two heterozygous are crossed.
Genetic dominance refers to the phenomenon in which the dominant allele masks the expression of the recessive allele in heterozygous individuals.
In this case, both parents can produce two types of gametes, i.e., either 'R' or 'r'.
In a Punnett square:
R r
R RR Rr
r Rr rr
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