What are the two versions of a gene controlling a trait called?

Correct option is D

Correct Answer: (D) Alleles

Explanation:

• The two versions of a gene controlling a trait are called alleles. Alleles are different forms of the same gene that arise due to variations in the DNA sequence.
• Each individual inherits one allele from each parent for each gene, and the combination of these alleles determines the expression of a trait.
• Alleles can be dominant or recessive, influencing how traits are passed down through generations.

Other Options:

• Proteins: Proteins are the products of gene expression, not the versions of a gene.
• Chromosomes: Chromosomes are structures that carry genes, but they are not the different forms of a gene.
• Mutations: Mutations refer to changes in the DNA sequence that can alter the function of genes, but they are not the versions of a gene itself.