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Waxy endosperm (wx), shrunken endosperm (sh), and yellow seedling (v) are encoded by three recessive genes in corn that are linked on chromosome 5. A corn plant homozygous for all three recessive alleles is crossed with a plant homozygous for all the dominant alleles. The resulting Fj are then crossed with a plant homozygous for the recessive alleles in a three-point testcross. The progeny of the testcross are:

wx

sh

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