For the answer to the question above, <span>If animals are related they share genes in common. The more genes they share on their DNA, the more alike they may be, like the rodents.
However, the behavior is caused not only by genes but by the environment plays an important part as well.</span>
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Meiosis continually reshuffles the genes resulting in a great variety of offspring. Without meiosis we would all look exactly alike. Meiosis allows each offspring to be different, and so potentially better, than the parent. If a disease comes along, there is a good chance that some of the population won't get sick or die because everyone's DNA isn't exactly alike.
Stem cells are unique in the fact that they can replicate any type of cell and their function. They help in cases of disease and injury because the replication properties can also be applied to white blood cells; these are cells that destroy pathogens.
