define genetics and variation?
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genetics :
the study of heredity and the variation of inherited characteristics.
the genetic properties or features of an organism, characteristic, etc.
variations :
a change or slight difference in condition, amount, or level, typically within certain limits.
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Genetic variation is the difference in DNA sequences between individuals within a population. Variation occurs in germ cells i.e. sperm and egg, and also in somatic (all other) cells.
Only variation that arises in germ cells can be inherited from one individual to another and so affect population dynamics, and ultimately evolution.
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