In corn, the seeds can be either colored ( C ) or white ( c ), and either non-sh

Question

In corn, the seeds can be either colored (C) or white (c), and either non-shrunken (Sh) or shrunken (sh). You crossed a homozygous colored, shrunken line (CCshsh) to a homozygous white, non-shrunken line (ccShSh) and obtained a F1 which you self-fertilized to obtain the following F2 progeny:

Phenotype                            Number of Plants

Colored, non-shrunken                   1031

Colored, shrunken                           473

White, non-shrunken                      465

White, shrunken                              31

b.) These genes are linked, are they in coupling or repulsion?

Explanation / Answer

If the genes are in coupling, the wild-type phenotypes duo( homozygous for both) will be in majority, in our case color and non-shrunken phenotypes(1031), and white and shrunken phenotypes(465), so the genes are in coupling

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