Suppose a cross has been made with maize between a plant, Ask an Expert

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Suppose a cross has been made with maize between a plant with colored, nonshrunken kernals (C/C Sh/Sh) and a plant with colorless, shrunken kernels (c/c sh/sh). The F1 progeny from this cross is backcrossed to a double recessive parent (c/c sh/sh) and the following results arise:
Genotype Number
C/c Sh/sh 225
C/c sh/sh 70
c/c Sh/sh 74
c/c sh/sh 231
a. what is the map distance between these genes?
b. test for independent assortment.

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