A couple has a baby that is monosomic for the X chromosome. This most likely occurred during meiosis because:

A. there was nondisjunction of the sister
chromatids.
B. there was an inversion in the X
chromosome and crossover occurred.
C. there was a duplication in the X
chromosome and crossover occurred.
D. there was translocation of another
chromosome onto the X chromosome.
E. either there was an inversion in the X
chromosome or there was a duplication in the
X chromosome and crossover occurred.


A

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