An organism that has two identical alleles for a trait is described as?

An organism that has two identical alleles for a trait is described as?

• A. Heterozygous
• B. Diploid
• C. Homozygous
• D. Haploid

Answer: (C)

This question tests how we describe the genotype at a gene locus when the two alleles are the same or different. Two identical alleles for a trait means the organism is homozygous for that trait, which can be represented as AA or aa depending on the allele present. If the alleles were different (one A and one a), the organism would be heterozygous (Aa). It’s also helpful to separate these ideas from haploid and diploid: haploid means having a single set of chromosomes (one allele per gene, by default), while diploid means having two sets (two alleles per gene). So, the term that fits two identical alleles at a locus is homozygous.

This question tests how we describe the genotype at a gene locus when the two alleles are the same or different. Two identical alleles for a trait means the organism is homozygous for that trait, which can be represented as AA or aa depending on the allele present. If the alleles were different (one A and one a), the organism would be heterozygous (Aa). It’s also helpful to separate these ideas from haploid and diploid: haploid means having a single set of chromosomes (one allele per gene, by default), while diploid means having two sets (two alleles per gene). So, the term that fits two identical alleles at a locus is homozygous.