Question

what is an allele?
a different version of a gene
a specific characteristic of a living thing
the most basic unit of inheritance that codes for a specific trait
the complete genetic blueprint, or instructions, for our cells

Explanation:

An allele is a different version of a gene. For example, for the gene that determines flower color in pea plants, there could be an allele for purple flowers and an allele for white flowers. A specific characteristic of a living thing is a trait. The most basic unit of inheritance that codes for a specific trait is a gene. The complete genetic blueprint for our cells is the genome.

Answer:

A. A different version of a gene