Question

What are the mechanisms by which aneuploidy and polyploidy are caused? What are the mechanisms by which aneuploidy and polyploidy are caused? The principal cause of aneuploidy is chromosome nondisjunction during mitosis or meiosis. Polyploidy in nature can result either from the duplication of euploid chromosome sets from a single species or from the combining of chromosome sets from different species. The principal cause of aneuploidy is paternal chromosome nondisjunction during meiosis. Polyploidy in nature results from the combining of chromosome sets from different species. The principal cause of aneuploidy is chromosome nondisjunction during mitosis. Polyploidy in nature can result from the deletion of one chromosome set during meiosis or during the first mitotic division. The principal cause of aneuploidy is maternal chromosome nondisjunction during meiosis. Polyploidy in nature results from the deletion of one chromosome set in somatic cells.

Answer 1

The correct answer is:

The principal cause of aneuploidy is chromosome nondisjunction during mitosis or meiosis. Polyploidy in nature can result either from the duplication of euploid chromosome sets from a single species or from the combining of chromosome sets from different species.  

Aneuploidy is a phenomenon when there is the presence of an abnormal number of chromosomes in a cell (an extra or missing chromosome). Usually it appears as a result of improper cell division (chromosomes don’t separate) and it can cause many genetic disorders.

Polyploidy refers to a state when there are more than two sets of chromosomes (one from mother one from father). Triploid (three sets of chromosomes) and tetraploid (four sets of chromosomes) chromosomes are examples of polyploidy. This phenomenon is most common in plants.