2 5
9. Which genes do you predict would be on or off for a nerve cell? Write your prediction in the
diagram below!
Nerve cell
ID TID UUDIIDID ID CIDLIDI
Part II: Environmental Factors That Affect Gene Expression
You now know that all the DNA in every cell of your body is the same. When genes are turned
on or off, they determine the types of cells that will form and the types of traits that will be
expressed in an organism. Environmental factors can also play a role in gene expression. For
example, the expression of hair color in the snowshoe hare is affected by temperature. The
int that gives the hare a brown-grey