which example is a variant of a gene?\n\nan allele\n\na gamete\n\nan autosome\n\na chromosome

Brief Explanations:

To solve this, we analyze each option:

• An allele is defined as a variant form of a gene. For example, in a gene controlling eye color, different alleles (like brown or blue allele) are variants of that gene.
• A gamete is a reproductive cell (sperm or egg), not a gene variant.
• An autosome is a non - sex chromosome, not a gene variant.
• A chromosome is a structure that carries genes, not a variant of a gene.

Answer:

A. an allele