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 f1 are then crossed with a plant homozygous for the recessive alleles in a three-point testcross. the progeny of the testcross are: