We have seen that mitosis and meiosis, having different goals,
differ in some important ways. The following questions refer to
these differences.
A) How do mitosis and meiosis differ in number of repetitions
of the reproductive portion of the cell cycle?
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B) Something very important to the production of gametes
occurs in the first part of meiosis (meiosis 1), involving an
interaction between homologous chromosomes, that does not occur in
mitosis. What is this process and how does it work?
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In both meiosis I and mitosis, chromosomes line up along the
mid-line of the nucleus, but with one important difference. What
is this difference?
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D) There are 2 processes that occur in meiosis that create a
great deal of genetic diversity in gametes. What are they?
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What is the primary mode of communication between cells?
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It is obvious that the reproduction of cells in an organism
must be tightly controlled. We learned about 3 ways in which cell
replication may be inhibited. List and define these 3 ways.
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What kinds of molecules function to stimulate cell
replication? In what situation (or situations) would this be
desirable?
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In lecture mention was made of a phenomenon called programmed
cell death, i.e., the intentional destruction of cells by an
organism. Can you think of any situations in which it would be
desirable for an organism to intentionally destroy its own
cells?