Which of the following is an example of a homozygous recessive allele? rr Rr RR Rw

rr would be an example of a homozygous recessive allele as a homozygous allele would have the same allele twice and a recessive allele is the lower cased allele of the pair.

rr

Explanation:

When a single trait has identical alleles it is said to be homozygous. An allele constitutes a specific gene, inherited from parents during reproduction. Alleles may be dominant (represented by two capital letters, RR) or recessive (represented by two small letters, rr).