CP Biology – Inheritance Practice Test

Example of a homozygous dominant genotype?

aa. Aa. AA. aA.

Correct Answer:

AA.

Explanation:

Homozygous dominant means having two copies of the dominant allele. In this context, the dominant allele is represented by A, so two dominant alleles appear as AA. This pair on the two homologous chromosomes makes the genotype homozygous (two identical alleles) and dominant (both alleles are the same and both are the dominant version). For contrast, aa is two recessive alleles (homozygous recessive), and aA (or Aa) is heterozygous, with one dominant and one recessive allele. A heterozygous genotype can still express the dominant trait, but it is not homozygous dominant because the alleles are not both dominant. Hence, the example that shows two dominant alleles is AA.

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