Trisomy in Biological Definition

Chromosome

... 21). This is also known as mongolism or trisomy 21 . Symptoms are decreased muscle tone, ... Edward's syndrome is the second most common trisomy after Down's Syndrome. It is a trisomy of chromosome 18. Symptoms include mental and ...

Down syndrome

... a number of genetic disorders , of which trisomy 21 (a nondisjunction ) is the most ... a number of genetic disorders of which trisomy 21 is the most frequent (95% of cases). trisomy 21 is the existence of the third copy of the ...

Edward's syndrome

... trisomy 18 or Edward's Syndrome , is the second most common trisomy after Down's Syndrome . Edward's Syndrome ... sets (trisomy) of chromosome 18 occur. trisomy 18 is therefore caused by a genetic abnormality ...

Nondisjunction

... genetic material, and is a common mechanism for trisomy or monosomy . Nondisjunction can occur in the ... conditions, including: Down Syndrome - trisomy of chromosome 21 Patau Syndrome - trisomy of chromosome 13 Edward Syndrome ...

Patau syndrome

... Patau syndrome , also known as trisomy 13 , is a chromosomal aberration, a disease ... Most cases of Patau syndrome result from trisomy 13, which means each cell in the body has three ... With a translocation, the person has a partial trisomy for chromosome 13 and often the physical signs of ...

X chromosome

... called mosaic 46,XY/47,XXY. Triple X syndrome (also called 47,XXX or trisomy X): This syndrome results from an extra copy of the X chromosome in each of a female's cells. Females with trisomy X have three X chromosomes, for a total of 47 chromosomes per cell. ...

Ploidy

... contains an abnormal or non-integer ploidy number. This may lead to problems in cell development. Most forms of aneuploidy in humans are lethal, but trisomy (three copies) of the sex chromosome (the cause of Klinefelter's syndrome and others) and of chromosome 21 (the cause of Down syndrome ) are ...

Ploidy

... contains an abnormal or non-integer ploidy number. This may lead to problems in cell development. Most forms of aneuploidy in humans are lethal, but trisomy (three copies) of the sex chromosome (the cause of Klinefelter's syndrome and others) and of chromosome 21 (the cause of Down syndrome ) are ...