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Ingrid and Alejandro are expecting a daughter. After conducting a prenatal test, they discover that their child has three copies of the X chromosome
Ingrid and Alejandro are expecting a daughter. After conducting a prenatal test, they discover that their child has three copies of the X chromosome (i.e., their child is XXX). This chromosomal disorder results from nondisjunction: sex chromosomes fail to segregate properly during meiosis. During which meiotic division, and in which parent, could nondisjunction have occurred to produce a child with this chromosomal disorder? Hint: It might help to sketch out the outcome of nondisjunction in meiosis I and II of both parents. Select all that apply. Meiosis I in the mother Meiosis II in the mother Meiosis I in the father Meiosis II in the father
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