Answer to Question #122459 in Genetics for Ruth

Question #122459
Both the husband and wife have normal vision. The wife gives birth to a colour-blind daughter. Is it more likely that the father is colour blind or has normal vision? What does this lead you to deduce about the girl’s parents genome?
1
Expert's answer
2020-06-22T13:25:29-0400

The colour blindness gene is carried on the X chromosome. As a result, as a daughter is colour blind, she carries two mutant genes associated with the blindness. It means that both parents have the mutant gene. As father has only one X chromosome, he is colour blind.


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