Feb 8, 2021
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Bio Word of the Day
Trisomy
A genetic disorder in which a person has three copies of a chromosome instead of two (ex. Down syndrome, Klinefelter syndrome, triple X syndrome, etc.)
Helpful study aids for genetics! Hardy-Weinberg / Nondisjunction in Meiosis!
Today is world #worlddownsyndromeday !Rock those blue and yellow socks! Here are some Q&As on #downsyndrome : http://www.ds-health.com/faq.htm #nondisjunction #chromosomes #karyotype #repost
"Nondisjuction in Meiosis," a piece to accompany an article in Scientific Slug, the UCSC Scientific magazine
November 2014
Original art by Rebecca Hoskins
Nondisjuction
Chromosomes fail to separate during meiosis
There are 3 types of Down Syndrome
a)Trisomy 21: In most cases (95%), all the body cells of the patient have three chromosomes 21, which happens due to the meiosis non-disjunction.
b)Mosaic Down Syndrome: Only some body cells have an extra chromosome 21 (non disjunction in mitosis).
c)Translocation Down Syndrome: In this case, a part of chromosome 21 is attached to another chromosome. So the patients have 2 chromosomes 21 plus a part of a third chromosome 21.
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