Some interesting aspects of cell division processes. This is not part of what you are required to know but I outlined. Like many things in biology certain types of compounds serve various functions. Thus actin and myosin proteins are responsible for in folding the animal cell wall to divide the cytoplasm in cytokinesis. These are also the proteins in muscle cells that contract. In order to control cell division there are a series of chemicals that turn on replication or suppress it. These can be growth factors, density dependent control factors, attachment factors, nutrients etc. There are also a whole series of factors that bring about cell death as normal process. In diseases such as cancer some of these factors are missing, suppressed or receptors are faulty and the cells continuously divided getting out of control and invading tissues through out the body with serious results All these and more are discussed in Chapter 12 of your text.
Heredity, asexual reproduction and sexual reproduction Off spring whether produced asexually or sexually receive genes from the parents. Like begets like, i.e., identical and are products of asexual reproduction. Example: Paramecium (Protista) undergoing mitosis or a multicellular organisms that buds off new individuals such as Hydra. Like begets like, but with variation resulting from sexual reproduction. What does that mean? Example: Humans produce humans but the off spring are not identical to either parent.