A human female with Turner syndrome (47,X)(47, X) also expresses the X-linked trait hemophilia, as did her father. Which of her parents underwent nondisjunction during meiosis, giving rise to the gamete responsible for the syndrome?


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Turner syndrome occurs as a result of nondisjunction during gametes production when homologous chromosomes do not disjoin during segregation. This can happen during meiosis I or II. As a result, the individual has only one sex chromosome. This condition also is called monosomy.

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