The most common type of ______ happens when the person has trisomy 21 in all of their cells as the result of nondisjunction in a parent gamete.
Added by Victor N.
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The question refers to a genetic condition characterized by the presence of an extra chromosome 21. Show more…
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Trisomy 21 is an example of nondisjunction in autosomes, also known as Down syndrome. This syndrome is caused by an extra copy of chromosome 21, usually donated by the sperm. Individuals with Down syndrome tend to have similar characteristics, including short stature, an extra eyelid fold, stubby fingers, fissured tongue, and sometimes mental disabilities. The chance of having a child with Down syndrome increases with maternal age due to the greater chance of developing abnormal cells.
Sri K.
A chromosomal disorder in which there is a third #21 chromosome is called:
Adi S.
If an individual such as Jenna with Down syndrome has three copies of chromosome 21, which of the following facts apply to the development of this syndrome? Select all that apply. Down syndrome results from nondisjunction in meiosis. Down syndrome only results from nondisjunction in meiosis I. Down syndrome only results from nondisjunction in meiosis II. Either the egg or the sperm that produced an individual with Down syndrome was missing a copy of chromosome 21 (n-1). Either the egg or the sperm that produced an individual with Down syndrome had an extra copy of chromosome 21 (n+1). Either the egg or the sperm that produced an individual with Down syndrome was haploid (n=23 chromosomes). Individuals with Down syndrome have 47 chromosomes in their body cells. Individuals with Down syndrome have 45 chromosomes in their body cells.
James K.
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