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Question 80

A boy carries one X chromosome and one Y chromosome. Which parent did each of them come from?

  1. The X came from his father and the Y from his mother
  2. Both came from his father, since the mother supplies neither
  3. The X came from his mother and the Y from his fatherCorrect answer
  4. Either arrangement is possible, since both parents can supply either chromosome

Explanation

His mother has no Y chromosome to give, so the Y he carries can only have arrived from his father, and the remaining chromosome of the pair must then be his mother's contribution. Reversing the two would require a Y chromosome to be present in the mother's cells, which is not part of the female arrangement.

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Question 80: A boy carries one X chromosome and one Y chromosome. Which… · Genetics Basics · Questena