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 cannot differ in any way when homologous.

A) They can contain different alleles for the same trait.  

when a reversible reaction is occurring in both directions at the same rate; the products and reactants do not change in concentration. a chemical reaction where the compound is broken into its constituent parts.

stress fractures occur largely in the feet and legs and are common in sports that require repetitive impact, primarily running/jumping sports such as gymnastics or track and field.