How can the two chromosomes that make up a homologous pair differ? They can contain different alleles for the same trait.
They can contain genes that code for different traits.
They can contain the same genes in different orders.
They can contain a different number of genes.

it's     c       this is a cell (b) with a nucleus (c) containing dna (a). the dna is organized into chromosomes (d). a section of the chromosome that codes for a trait is called a gene (e).

meiosis is the first to occur after the nuclei of opposite of opposite mating types fuse