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The following diagram shows nondisjunction in either Meiosis I or Meiosis II. The cell has only one pair of homologous chromo
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In cells A and D, the ploidy is n+1. Upon fertilization with a normal gamete (n), the resulting individual will have (2n+1) , i.e. 3 chromosome in a cell. This condition is called trisomy.

On the other hand, gamete B will lead to (n-1), monosomy. And, gamete C is a normal gamete and will produce a normal individual upon fertilization with a normal gamete.

Thus, the correct choice should be:

(d) A and D

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