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The gene for color blindness in humans is found on the X chromosome. A boy has a...

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zachloveslexie | Student, Grade 10 | eNotes Newbie

Posted November 21, 2010 at 9:19 PM via web

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The gene for color blindness in humans is found on the X chromosome. A boy has a color-blind father. Will the boy be color blind? Explain

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justaguide | College Teacher | (Level 2) Distinguished Educator

Posted November 21, 2010 at 9:55 PM (Answer #1)

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Color blindness is X linked recessive ailment. In ailments that are X linked recessive, there is no transmission of the ailment from the father to the son as the son acquires the Y chromosome from the father and the X chromosome from the mother.

The color blind father would pass on the gene for color blindness to all his daughters who would become carriers of the ailment. If the mother is a carrier, there is a 50% chance that the son would be affected by the ailment.

Therefore the fact that the boy's father is color blind is irrelevant and does not mean that he will be color blind too.

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