Which of the following represents a homozygous recessive genotype?

Which of the following represents a homozygous recessive genotype?

Step 1: Understand what a genotype is. A genotype is the genetic makeup of an organism, represented by letters.
Step 2: Learn about alleles. Alleles are different forms of a gene. For example, 'A' and 'a' are two alleles for a gene.
Step 3: Know the difference between dominant and recessive alleles. A dominant allele (like 'A') can mask the effect of a recessive allele (like 'a').
Step 4: Understand what homozygous means. Homozygous means having two identical alleles for a trait. This can be either dominant (AA) or recessive (aa).
Step 5: Identify what homozygous recessive means. Homozygous recessive means having two recessive alleles, which is represented as 'aa'.
Step 6: Conclude that 'aa' is the representation of a homozygous recessive genotype.

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