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During normal meiosis, homologous chromosomes pair up and separate so that each gamete receives a copy of every chromosome. Sometimes an error is made during this separation and homologous chromosomes fail to separate. This results in one gamete that has two copies of the chromosome, and another gamete that does not have the chromosome at all. This type of error is known as _______ and usually results in zygotes that either do not develop to term or have severe abnormalities. A. chromosome inversion B. chromosome insertion C. chromosome translocation D. chromosome nondisjunction

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The answer would be D. chromosome nondisjunctionn.  Hope this helps on your study island mate :D

Answer: The correct option is D. chromosome nondisjunction.

Nondisjunction is a failure of either of two homologous chromosomes of passing into separate cells during the first meiotic division or the two chromatids of a chromosome are passed to the different cells during second meiotic division or during the mitosis. In other way, when the paired chromosomes fail to disjoin or to separate at the time of cell division, both the chromosomes go to only one daughter cell and none goes to the other. The error in chromosome numbers is caused due to nondisjunction like trisomy in Down’s syndrome and monosomy in Turner’s syndrome.  

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