Question

what is an allele?
a) a type of cell
b) the position of a nucleotide
c) a type of chromosome
d) an alternative form of a gene

Explanation:

An allele is an alternative form of a gene. Genes are segments of DNA that code for a particular trait, and different alleles can result in variations of that trait. For example, for the gene that determines eye - color, there are different alleles for blue, brown, etc.

Answer:

d) An alternative form of a gene