The genes within each chromosome can be expressed in different forms called ______.

A) zygotes
B) nuclei
C) gametes
D) alleles

Chromosome

A structure within the cell nucleus made up of DNA and proteins that contains the genetic material of an organism.

Alleles

Variants of a gene that occur at the same place on a chromosome, contributing to the diversity of genetically influenced traits.

Gametes

Reproductive cells (sperm in males and ova in females) that unite during sexual reproduction to form a new organism.