Question

6 describe how the genotypes rr and rr result in the same phenotype.

Explanation:

In genetics, the concept of dominant and recessive alleles applies. The allele \( R \) is dominant, and \( r \) is recessive (assuming a simple dominant - recessive relationship). For the genotype \( RR \), both alleles are dominant, so the dominant trait is expressed. For the genotype \( Rr \), the dominant allele \( R \) masks the effect of the recessive allele \( r \), so the dominant trait is also expressed. Thus, both \( RR \) and \( Rr \) can result in the same phenotype because the presence of at least one dominant allele (\( R \)) leads to the expression of the dominant trait.

Answer:

The genotype \( RR \) has two dominant alleles, so the dominant trait is expressed. The genotype \( Rr \) has one dominant (\( R \)) and one recessive (\( r \)) allele, but the dominant allele \( R \) masks the recessive allele \( r \), so the dominant trait is also expressed. Thus, \( RR \) and \( Rr \) can have the same phenotype due to the dominant allele's masking effect on the recessive allele (in a simple dominant - recessive genetic relationship).