Question

1. In corn, waxy endosperm (wx), shrunken endosperm (sh), and yellow seedlings (v) are encoded by 3 recessive genes located on chromosome 5. A corn plant homozygous for all 3 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 3-point testcross. The progeny of the testcross are: wx sh V 82 Wx Sh v 91 Wx sh V 3,449 wx sh v 3,458 Wx sh v 1,525 wx Sh V 1,531 wx sh V 292 Wx Sh v 289 Total 10,717 a. Determine the order of the genes on the chromosome. b. Calculate the map distances between the genes. c. Determine the coefficient of coincidence and the interference among these genes.

          1. In corn, waxy endosperm (wx), shrunken endosperm (sh), and yellow seedlings (v) are encoded by 3 recessive genes located on chromosome 5. A corn plant homozygous for all 3 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 3-point testcross. The progeny of the testcross are:
wx sh V 82
Wx Sh v 91
Wx sh V 3,449
wx sh v 3,458
Wx sh v 1,525
wx Sh V 1,531
wx sh V 292
Wx Sh v 289
Total 10,717
a. Determine the order of the genes on the chromosome.
b. Calculate the map distances between the genes.
c. Determine the coefficient of coincidence and the interference among these genes.

1. In corn, waxy endosperm (wx), shrunken endosperm (sh), and yellow seedlings (v) are encoded by 3 recessive genes located on chromosome 5. A corn plant homozygous for all 3 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 3-point testcross. The progeny of the testcross are:
wx sh V 82
Wx Sh v 91
Wx sh V 3,449
wx sh v 3,458
Wx sh v 1,525
wx Sh V 1,531
wx sh V 292
Wx Sh v 289
Total 10,717
a. Determine the order of the genes on the chromosome.
b. Calculate the map distances between the genes.
c. Determine the coefficient of coincidence and the interference among these genes.

Added by Jared R.

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