(C) In genetics,a gene that expresses its phenotype only when present in a homozygous condition (e.g.,$aa$) is known as a recessive gene. Dominant gen

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(C) In genetics,a gene that expresses its phenotype only when present in a homozygous condition (e.g.,$aa$) is known as a recessive gene. Dominant genes are expressed in both homozygous $(AA)$ and heterozygous $(Aa)$ conditions. Therefore,the correct answer is the recessive gene.