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

Read the following scenario to answer the following question. in some zoos, rare crosses between a male lion and a female tiger have produced hybrid offspring called "ligers." male ligers are sterile but some female ligers are fertile. in the wild, lion and tiger ranges do not naturally overlap, making such a cross unlikely. furthermore, the solitary behavior of tigers and the social organizations of lions create behavioral differences. applying the biological species concept, the sterility of ligers reveals that a. lions are probably a subspecies of tigers b. tigers and lions are the same species c. a new species called "ligers" is forming d. tigers and lions are separate species

How can an organ, such as the lungs, work for multiple body systems?

Which of the following organisms are capable of self-fertilization? a.plants b.tigers c.humans