for wrinkled peas, r. In this case, R represents the dominant allele, leading to round pea formation, while r represents the recessive allele, which results in wrinkled peas when homozygous (rr). When considering the inheritance patterns in pea plants, a plant with at least one R allele (RR or Rr) will produce round peas, while only a plant with two recessive alleles (rr) will produce wrinkled peas.
If you have specific questions about pea plant genetics, such as Punnett squares, phenotypic ratios, or genetic crosses, feel free to ask!