The role of DNA in cellular differentiation is to — A. provide a series of genes that can be turned on or off.
B. mutate genes when a cell divides in two.
C. produce mitochondria for energy production.
D. protect genes from damage as they reproduce.

The allele for curly hair is incompletely dominant. if a mother is homozygous for curly hair and the father is homozygous for straight hair, what percentage of the offspring will exhibit characteristics of both parents? 25 percent 50 percent 75 percent 100 percent

In a vegetable garden 45 bean plants have been eaten by deer 5 are untouched what is the frequency of bean plants in the garden that have been eaten?

Ecology can best be described as the study of what