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

Apart of an ecosystem that can restrict the growth of a population is referred to as

The fish shown above is a tarpon. it is a fast-swimming and powerful open-water fish. its closest relatives, oddly, are burrow-dwelling conger eels that stay on the bottom. both eels and tarpon developed from snake-like larvae that float in the plankton during the first stages of life. once they mature, tarpon and eels are not found near one another in the ocean. the tarpon and the eel illustrate all of the following except

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 8 options: the cold balloon expands and rises. the warm balloon shrinks and sinks. the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the warm balloon expands and rises. the cold balloon shrinks and sinks.