Color Blindness Problem Set
Problem 8: Grandparents
Tutorial to help answer the question
We don't know if any of Audrei's grandparents were red-green color
blind, but we can make some educated guesses. Is it possible that all of
Audrei's grandparents have normal vision?
X chromosome inheritance
The X chromosomes are inherited from either maternal grandparent and paternal grandmother
The diagram shows how the X and Y chromosomes are inherited from the maternal and paternal grandparents to the parents to the son.
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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