Color Blindness Problem Set

Problem 9: Stephan's Father

Tutorial to help answer the question

Would we predict that Stephan's father is color blind?

A. Yes
B. No


There would be no reason to predict that Stephan's father is color blind. Stephan inherited the color perception defect from Barbara just like his half-brother Paul.

The Y chromosome is passed strictly from the father to male children in each generation. No male from the father's side of the family can be a source of genes on a women's X chromosome.

The Biology Project
University of Arizona
Saturday, October 10, 1998
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