What is a homozygous recessive genotype?

A homozygous recessive genotype refers to the genetic makeup of an organism that possesses two identical alleles for a specific trait, both of which are recessive. This means that for the trait in question, both alleles will not express the dominant phenotype and can only express the recessive phenotype. For instance, if the trait is flower color where "r" represents the recessive allele for a white flower, a homozygous recessive genotype would be "rr". As a result, the organism would display the white flower trait.

This genotype is key in genetics because it can be used to predict inheritance patterns and understand how traits are passed from parents to offspring. The understanding of dominant and recessive alleles plays an essential role in breeding practices, genetic research, and understanding genetic disorders that may arise from such genotypes.

In contrast, the other choices do not accurately define what a homozygous recessive genotype is, as they describe different genetic combinations involving dominant alleles or multiple alleles that do not pertain to the specific definition required by the question.