Learning Objectives:

2.A.3: Organisms must exchange matter with the environment to grow, reproduce, and maintain organization.

2.E.1:  Timing and coordination of specific events are necessary for the normal development of an organism, and these events are regulated by a variety of mechanisms.

3.A.1:  DNA, and in some cases RNA, is the primary source of heritable information.

3.B.1:  Gene regulation results in differential gene expression, leading to cell specialization.

3.C.1:  Changes in genotype can result

4.A.3:  Interactions between external stimuli and regulated gene expression result in specialization of cells, tissues, and organs.