The Law of Segregation
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Mendel's law of segregation holds that an organism's two alleles at a locus separate during gamete formation, so each gamete carries exactly one.
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A Yy plant produces Y-carrying and y-carrying pollen and egg cells, never a gamete carrying both.
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Segregation separates the two alleles at one locus — it says nothing about how two different loci sort relative to each other.