Which term describes an alternative form of a single gene that is passed from generation to generation?

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

Answer: (B)

Verified step by step guidance

1. Understand that genes can have different versions or variations that exist at the same position on a chromosome.
2. Recall that a chromosome is a structure made of DNA that contains many genes, so it is not the term for a variant of a single gene.
3. Recognize that a genotype refers to the combination of alleles an organism has for a particular gene, not the variant itself.
4. Know that a locus is the specific physical location of a gene on a chromosome, not the variant form of the gene.
5. Identify that the term for an alternative form of a single gene passed from generation to generation is an allele.