Which term best describes a different, alternative version of a gene?

• A. Locus
• B. Allele
• C. Genotype
• D. Chromosome

Answer: (B)

Verified step by step guidance

1. Understand that a gene is a segment of DNA that codes for a specific trait, and it can exist in different forms called variants.
2. Recognize that the term 'locus' refers to the specific physical location of a gene on a chromosome, not the variant itself.
3. Know that 'chromosome' is the structure that carries many genes, so it is a broader term than a single gene variant.
4. Identify that 'genotype' refers to the combination of alleles an organism has for a particular gene, rather than the variant itself.
5. Conclude that the correct term for a different, alternative version of a gene is 'allele', which represents the specific variant at a gene's locus.