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How many copies of Chromosome 21 are there in someone who has Down syndrome?
Wiki User
∙ 13y ago
Down syndrome is also known as "Trisomy 21" - a reference to the fact that someone with Down syndrome has 3 pairs of chromosomes 21.
Wiki User
∙ 13y ago
Wiki User
∙ 9y agoNo. They have three. That is why another common name for Down's syndrome is trisomy 21 (trisomy=3 copies of one chromosome, the 21 tells which chromosome has the trisomy).
There is another type of Down's that tends to run in families that is known as familial Down' syndrome. It is caused by a small part of chromosome 21 (the part containing the information that causes the Down's symptoms) is translocated (moved) to another chromosome. Usually chromosome 14 but, it could be others also. This gives the patient 3 copies of the genetic material that causes downs syndrome without them having 3 complete copies of chromosome 21
Wiki User
∙ 12y agoPeople with down syndrome have 3 copies of number 21
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What does the karyotype of a person with down syndrome show?
A genetic disorder caused by the presence of all or part of a third copy of chromosome 21.
Is Down syndrome a genetic disorder or a chromosome disorder?
Down syndrome is a chromosomal disorder. It is caused by having 1 extra chromosome (chromosome 21).
Which condition results when cells receive three copies of chromosomes 21?
Down syndrome results when cells receive three copies of chromosome 21.
Which of the following are example(s) of trisomy---Turner Syndrome Down's Syndrome or Klinefelter's Syndrome?
Trisomy means having three copies of a chromosomes. Turner's syndrome is NOT an example of trisomy. Someone with Turner's syndrome has only one X chromosome. Down's syndrome IS an example of trisomy. Someone with Down's syndrome has 3 copies of chromosome 21. Klinefelter's syndrome is a tricky one. On one hand, it would be considered trisomy because they have 3 sex chromosomes. However, they are not all the SAME sex chromosomes. Someone with Klinefelter's has 2 X chromosomes and one Y chromosome.
What common condition is caused by the presence of three copies of chromosome 21?
Most cases of Down syndrome result from trisomy 21, which means each cell in the body has three copies of chromosome 21 instead of the usual two copies. The extra genetic material disrupts the normal course of development, causing the characteristic features of Down syndrome.Hope this helps.
What are four types of chromosomal mutations?
Four types of chromosomal mutations are Down syndrome (which is a mutation in which there are three copies of chromosome 21), Kinefelter Syndrome (which is a mutation in which a male has an extra X-chromosome), Turner Syndrome (which is a mutation in which a female is missing an X-chromosome), and Patau Syndrome (which is a mutation in which there are three copies of chromosome 13).
What are four of chromosomal mutation?
Four types of chromosomal mutations are Down syndrome (which is a mutation in which there are three copies of chromosome 21), Kinefelter Syndrome (which is a mutation in which a male has an extra X-chromosome), Turner Syndrome (which is a mutation in which a female is missing an X-chromosome), and Patau Syndrome (which is a mutation in which there are three copies of chromosome 13).
In one kind of abnormal chromosome inheritance called down syndrome a child has three copies of what?
chromosome 21
What is it called when an individual has three copies of a chromosome?
The presence of three copies of a chromosome is known as a trisomy. An example would be Trisomy 21, also known as Down Syndrome.
What chromosomes are affected in someone who has Down syndrome?
chromosome 21
What gene or chromosome is affected by down syndrome?
Chromosome 21 is tripled in Down syndrome.
In one kind of abnormal chromosome inheritance called?
In one kind of abnormal chromosome inheritance called Down syndrome, a child has three copies of Chromosome 21!
