Trisomy X, a disorder in which a female has an extra X chromosome, is the result of

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Trisomy X, a disorder in which a female has an extra X chromosome, is the result of nondisjunction. This failure in oogenesis would first be apparent when
(A) The homologous chromosomes are lined up in the middle
(B) The sister chromatids are lined up in the middle
(C) The nuclear envelope breaks down before meiosis
(D) The homologous chromosomes are pulling apart

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