Sixteen-year-old Rhapsody has just learned that her younger brother Clyde is colorblind.Although she knows she has color vision because her cat,Juice,is clearly orange,and she reads that nearly all people with colorblindness are boys,she is concerned about her own sons one day.If she is a carrier for colorblindness,then the risk that a son of hers is colorblind is

Question

Quizplus · Accepted Answer

If Rhapsody is a carrier for colorblindness, she has one normal X chromosome and one X chromosome with the colorblindness gene. Her sons will inherit one X chromosome from her and one Y chromosome from their father. Therefore, there is a 50% (1/2) chance that a son will inherit the X chromosome with the colorblindness gene and be colorblind.

Sixteen-Year-Old Rhapsody Has Just Learned That Her Younger Brother Clyde