Cellular Differentiation,or Cell Specialization,results from _____

Multiple Choice

Cellular differentiation,or cell specialization,results from _____.

A) the "turning off" of some genes and the "turning on" others
B) the separation of stem cells from each other,so they do not "know" what their "neighbors" are becoming
C) cellular division;when cells divide by mitosis,the daughter cells are specialized
D) the birth process;all the cells of a fetus differentiate by the time it is born
E) fertilization of an egg;the fusion of the sperm and egg initiates cell specialization within minutes