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: wx sh V 87; Wx Sh v 90; Wx Sh V 3,472; wx sh v 3,470; Wx sh V 1,510; wx Sh v 1,530; wx Sh V 242; Wx sh v 200 (a) Determine the order of these genes on the chromosome, (b) Calculate the map distances between the genes, (c) Determine the coefficient of coincidence and the interference among these genes,
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Answer: The coefficient of coincidence is 0.8 and the interference value is 0.2.
B. The coefficient of coincidence is 0.8 and the interference value is 0.021.
C. The coefficient of coincidence is 0.2 and the interference value is 0.2.
D. The coefficient of coincidence is 0.9797 and the interference value is 0.2.
E. The coefficient of coincidence is 0.9797 and the interference value is 0.021.
Asked on 7 Aug 2018
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