In fundamentals of genetics, what are the different forms of a gene at the same locus called?

• A. Phenotypes
• B. Alleles
• C. Codons
• D. Chromatids

Answer: (B)

Verified step by step guidance

1. Understand that a gene is a segment of DNA located at a specific position, or locus, on a chromosome.
2. Recognize that different versions or variants of the same gene found at the same locus are called alleles.
3. Recall that alleles can result in different traits or characteristics, which are observed as phenotypes.
4. Note that codons are sequences of three nucleotides in mRNA that specify amino acids, not different forms of a gene.
5. Remember that chromatids are duplicated strands of a chromosome, not variants of a gene.