Which of the following represents a genotype that is homozygous recessive?

Which of the following represents a genotype that is homozygous recessive?

Correct Answer: aa

Step 1: Understand what a genotype is. A genotype is the genetic makeup of an organism, represented by letters.
Step 2: Know the difference between alleles. Alleles are different forms of a gene. They can be dominant (represented by a capital letter) or recessive (represented by a lowercase letter).
Step 3: Identify what homozygous means. Homozygous means that both alleles for a gene are the same.
Step 4: Recognize what recessive means. Recessive alleles are only expressed when two copies are present (e.g., 'aa').
Step 5: Look for the genotype that has two lowercase letters. This indicates that both alleles are recessive.
Step 6: Conclude that 'aa' is the genotype that is homozygous recessive because it has two identical recessive alleles.

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