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Genetic Disorders

Disadvantageous physical traits that come from uncommon alleles of a gene. These are often inherited in a recessive manner.

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Nondisjunction
Community Contributed
Illustrates a problem that can occur during gametogenesis. Down's syndrome arises when two sister chromatids fail to separate during the final stages of meiosis. Start at 1:10 if you just want to see the nondisjunction.

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