What term describes a genotype with identical alleles at a locus?

What term describes a genotype with identical alleles at a locus?

• A. Heterozygous
• B. Homozygous
• C. Chimera
• D. Wild type

Answer: (B)

When both copies of the gene at a particular location are the same allele, the genotype is homozygous. This means the two chromosome copies carry identical variants, like AA or aa. If the two alleles are different, the genotype is heterozygous. Chimera describes an organism with genetically distinct cell lines from different zygotes, not about a single gene’s zygosity. Wild type refers to the typical allele found in nature, not whether the two alleles at a locus match. So, identical alleles at a locus describe a homozygous genotype.

When both copies of the gene at a particular location are the same allele, the genotype is homozygous. This means the two chromosome copies carry identical variants, like AA or aa. If the two alleles are different, the genotype is heterozygous. Chimera describes an organism with genetically distinct cell lines from different zygotes, not about a single gene’s zygosity. Wild type refers to the typical allele found in nature, not whether the two alleles at a locus match. So, identical alleles at a locus describe a homozygous genotype.