Question

Alleles are ______.

Options

• self-fertilizing, true-breeding homozygotes

• different molecular forms of a chromosome

• different molecular forms of a gene

• none of the above

Answer 1

Alleles are different molecular forms of a gene.

Explanation:

Alleles are alternative versions of the same gene that occupy the same position (locus) on homologous chromosomes. They differ in their molecular DNA sequence and are responsible for variations in a inherited trait. Each individual inherits two alleles for a gene, one from each parent. Thus, alleles are different molecular forms of a gene, not of a chromosome or homozygous conditions.