== == Down syndrome, also known as "Trisomy 21," is not caused by a single particular gene or DNA sequence. Rather, Trisomy 21 is caused by the presence of an "extra" chromosome 21 in the set inherited by a Down syndrome patient. The normal chromosome number is 46 (consisting of 2 sex chromosomes, XX or XY, and 44 non-sex chromosomes); Trisomy 21 patients thus have 47 and are denoted as 47, t21.
There isn't exactly a "Down Syndrome gene". Down Syndrome is properly called trisomy 21; it's a defect where there are three, rather than two, copies of chromosome 21 present in the cell nucleus. In some cases the "extra" copy may be only partial.
Individuals with Down syndrome have an extra 21st chromosome
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In some down syndrome cases the child will get 3 copies of a chromosome known as chromosome 21.
Down syndrome, also called mongolism or trisomy 21, is caused by an abnormality in the development of chromosome 21.
Down syndrome is a complete duplication of the entire 21st chromosome.
chromosome
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down syndrome
21 chromosomes
Down Syndrome is caused by a triplication of the 21st chromosome.
down's syndrome
47There are 47 chromosomes in someone with Down syndrome; the 21st pair has an extra chromosome. Most people have 46 chromosomes. Down syndrome is also known as "Trisomy 21" - a reference to the fact that someone with Down syndrome has 3 pairs of chromosomes on their 21st pair.
If it had more chromosomes it will cause to down's syndrome
Down Syndrome often occurs when chromosomes fail to separate properly during meiosis.
The phrase is spelled Down Syndrome. Down Syndrome is a disorder caused by a mutation of the chromosomes.
#21
An individual with Down Syndrome has the presence of all or part of an extra 21st chromosome.
A person with Down Syndrome will have 3 chromosomes for the 21st autosome. Karyotypes show these chromosomes which help to diagnose Down Syndrome.
chromosome 21