A mutation is a change in trait. For example people who are lactose intolerant are normal, but people that can can drink milk without a problem have mutated. Hopefully this makes sense and helped.
I thinking the answer was for some genes, both alleles express together. Others combine to give an average phenotype....
The cytoskeleton is the grid-like lattice of protein f<span>ibers. The function of the cytoskeleton is that it maintains the shape and support of the cell, and also assists with the organelle movement. </span>
