Which is a genotype for pea shape? A. r B. R C. RR D. round peas

The genotype for pea shape is Round - RR or Rr and for the wrinkled - rr. The genotype is the genetic make up of an organisms, it determines the phenotype (the physical trait). In this case; the round pea shape is dominant to the wrinkled shape; which means the phenotype of round shape will be expressed when we have both homozygous dominant (RR) and heterozygous (Rr), while the wrinkled shape will be expressed by homozygous recessive (rr).