Color Blindness Problem Set

Problem 5: Pedigree representation for Liz

In her message, Audrei also tells us that her sister Liz and brother Paul are also color blind, but that her brother David has normal vision. How will Liz be represented on the family pedigree?

Liz is color blind. She inherited one X-chromosome from each parent. Each daughter received the X-chromosome with the red-green color blind allele from their father. Caroline received the normal allele on the X-chromosome from their mother, while Audrei and Liz got the X-chromosome with the red-greeen color blind allele.