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The long and medium neck giraffes will be more common in populations.

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The long and medium neck girrafes reproduce and with a Punnett Square you can tell that with two medium neck giraffes 1 out of 4 baby giraffes will have a short neck.

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The short neck giraffes tend to die from the drought while medium and long neck giraffes survive

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In the giraffe lab, there were short neck giraffes, medium neck giaffes, and long neck giraffes. The variation is the neck length.

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Genetic variation is the variety of gene frequencies. It can also refer to the differences between individuals or populations. The ultimate source of genetic variation is mutation.