Biology CLEP Prep Practice Exam

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What is the difference between a homozygous and heterozygous genotype?

  1. Homozygous refers to two different genes, while heterozygous refers to two identical genes

  2. Homozygous refers to two identical genes, while heterozygous refers to two different genes

  3. Homozygous is the dominant form of a gene, while heterozygous is the recessive form of a gene

  4. Homozygous is the recessive form of a gene, while heterozygous is the dominant form of a gene

The correct answer is: Homozygous refers to two identical genes, while heterozygous refers to two different genes

Homozygous refers to a genotype where an organism has two identical genes for a specific trait, while heterozygous refers to a genotype where an organism has two different genes for a specific trait. Option A is incorrect because it mistakenly switches the definitions of homozygous and heterozygous. Option C and D are incorrect because they incorrectly define homozygous and heterozygous in terms of dominance and recessiveness, which is not always the case. There can be instances where both alleles in a heterozygous genotype are equally expressed, or where dominance is determined by other factors. Therefore, option B accurately captures the difference between homozygous and heterozygous genotypes.

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