Chromosone pairs contain diffrent versions of genes, which are called?

A.alleles
B.chromosome
C.mitosis
D.DNA
E.RNA
F.diploid
G.meiosis
H.phenotype
Is the answer A??

Agree.

what is a mutation?

Yes, the correct answer is A.alleles. Alleles are the different versions of genes that can be present on the members of a chromosome pair. Alleles can be inherited from parents and can result in variations in traits or characteristics.