During embryonic development cells not only increase in number but also undergo differentiation. Describe what occurs during differentiation. During differentiation cells become specialized and are organized the into tissues and organs of the organism. The fertilization membrane, along with other changes of the egg's surface, prevents the entry of additional sperm cells. Fertilization is followed by cleavage.
Cleavage is a series of rapid cell divisions that produce a ball of cells from the zygote.
The eggs of most animals have a definite polarity. The vegetal pole contains the yolk which impedes cell division, therefore, most cleavage of the organism occurs at the animal pole. Assessment to top Students who correctly answer enough questions to win the game show an understanding of the vocabulary and concepts. A student project or homework assignment can be to make up question and answer cards for the game. Then only the question and answer cards would have to be made up.