In the fundamentals of genetics, an alternative form of a gene is called a(n):

• A. codon
• B. allele
• C. genotype
• D. chromosome

Answer: (B)

Verified step by step guidance

1. Understand the question is asking for the term that describes an alternative form of a gene.
2. Recall that a gene can have different versions, which are called alleles.
3. Recognize that a codon is a sequence of three nucleotides in mRNA that codes for an amino acid, not an alternative gene form.
4. Know that genotype refers to the genetic makeup of an organism, not the alternative forms themselves.
5. Remember that a chromosome is a structure that contains many genes, not the alternative forms of a single gene.