If R and r, denotes the genes for a character, the offspring of the cross between RR and Rr are

In genetics, the capital letter 'R' represents a dominant allele for a particular gene, while the lowercase letter 'r' represents a recessive allele. When an individual has two copies of the same allele, it is called homozygous (RR or rr). When an individual has one dominant and one recessive allele, it is called heterozygous (Rr). So, if RR (homozygous dominant) is crossed with Rr (heterozygous), the possible gametes for RR are R, and the possible gametes for Rr are R and r. Thus, the possible offspring are 50% RR (homozygous dominant) and 50% Rr (heterozygous). This means that the correct answer is: 2RR, 2Rr.