Waxy endosperm (wx), shrunken endosperm (sh), and yellow seedling (v) are encoded by three recessive genes in com that are linked on chromosome 5. A com plant homozygous for all three recessive alleles is crossed with a plant homozygous for all the dominant alleles. The resulting Ft are then crossed with a plant homozygous for the recessive genes in a three-point testcross. The progeny of the testcross are given below:
wx sh V 87
Wx Sh v 94
Wx Sh V 3,479
wx sh v 3,478
Wx sh V 1,515
wx Sh v 1,531
wx Sh V 292
Wx sh v 280
Total 10,756
a. Determine the order of these genes on the chromosome.
b. Calculate the map distance between the genes.
Answers: 2
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