Principles Of Biomedical Science Practice Exam

Having two different alleles for a given gene is referred to as?

Homozygous Monosomy Hemizygous Heterozygous

Correct Answer:

Heterozygous

Explanation:

Having two different alleles for a gene means the genotype at that locus is heterozygous. Each person inherits one allele from each parent, so when those two copies are not the same (for example, A and a), you’re heterozygous. This is different from homozygous, where both copies are identical (AA or aa). Monosomy refers to having only one copy of a chromosome, not two alleles at a single gene. Hemizygous describes having only one allele for a gene in a diploid organism, often used for sex-linked genes in males.

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