bio lab 2 animal devolpment pre-lab

4 differentiation is when determined cells become a

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4) Differentiation is when determined cells become a particular type of cell. It is also the turning on and off of genes which is determined by internal cell events which then can be triggered by external signals. The type of signals the cell receives is then determined by the location of it within the organism. Developmental genes play major roles in the development of an organism and the differentiation of genes by acting as on and off switches. The turning on of a developmental gene usually leads to a “cascade” of other genes being turned on and off. This results in cells differentiating in particular ways. 5) Programed cell death or apoptosis involves two genes ced-3 and ced-4 that produce proteins that trigger cell death. While in humans the gene BCl-2 produces a protein that blocks the effect that the two before mentioned genes produce, thus allowing this cell to live while others die. Thus if there was a mutation with the genes ced-3 and ced-4 that did not allow them to produce the needed protein, then uncontrolled cell growth will occur resulting in a tumor. If the BCl-2 gene has a mutation then resulting in it not being able to produce it’s “protective” protein then it will result in cells dying that should not be.
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