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What chromosomes do you get an extra copy for in humans that results in Down syndrome?
Down Syndrome is caused by a triplication of the 21st chromosome.
How is Down syndrome cause?
Down's sydrome is caused by trisomy 21, when there are three 21st chromosomes instead of the normal two.
On what chromosomes can you find the genetic disorder called Down Syndrome?
Trisomy 21 is the scientific name for the cause of Down Syndrome. Triplication of the 21st chromosome occurs giving it 3 chromosomes total. This is caused when disjunction (splitting) of the chromosome during meiosis does not occur and leaves one cell with 22 chromosomes and the other with 24. When a cell with an abnormal # of chromosomes (24) merges with one having the normal # (23), the resulting fertilized egg has (3) 21st chromosomes or a total of 47.
What disease is called by a genetic mutation?
cystic fibrosis
What is the genetic cause of Down syndrome?
Both syndrome's indicate the presence of a 47th chromosome (or extra part of a chromosome). Most humans have 23 pairs of chromosomes, totaling 46 chromosomes. For Down's syndrome, the 47th chromosome appears with the 21st pairing. For Klinefelter's syndrome the 47th chromosome appears with the 26th pairing (the gender chromosomes.)
Can someone have less than 46 chromosomes?
It is certainly possible to have more than 46 as in Trisomy 21 (or down syndrom) where "one cell has two 21st chromosomes instead of one, so the resulting fertilized egg has three 21st chromosomes".
Is Down syndrome caused by a recessive gene?
Down syndrome is caused by a third copy on chromosome 21 and is present at conception or shortly after. It is mostly a random (and relatively common) occurrence, unless it is of the translocation type which is rare and genetic.
Trisomy 21 Down syndrome xxy kleinfelter syndrome and xo turner syndrome are all caused by?
Nondisjunction -Trisomy 21(Down Syndrome) means there are 3 chromosomes on the 21st pair of chromosomes. -Kleinfelters (XXY) means there is an extra chromosome on the 23rd pair(where the sex chromosomes lie). -Turner Syndrome(XO) On the 23rd pair, there is no Y or second X chromosome. The female can survive with this.
Can you get Down syndrome from your father?
you can not "get" down syndrome, you are either born with it or you are not born with it. there has only been one documented case of a male with down syndrome fertilizing an egg and it resulted in a miscarriage. down syndrome is not something you can catch. it is a chromosomal defect, a fluke of nature. it is also known as Trisomy 21. typically advanced people are born with 46 pairs of chromosomes. each pair has only two chromosomes. people with down syndrome have an extra chromosome pair of the 21st set of chromosomes. so people with down syndrome have 47 pairs of chromosomes. Three to four percent of all cases of trisomy 21 are due to Robertsonian Translocation. In this case, two breaks occur in separate chromosomes, usually the 14th and 21st chromosomes. There is rearrangement of the genetic material so that some of the 14th chromosome is replaced by extra 21st chromosome. So while the number of chromosomes remain normal, there is a triplication of the 21st chromosome material. Some of these children may only have triplication of part of the 21st chromosome instead of the whole chromosome, which is called a partial trisomy 21. hope this helps your question. =]
Does a pathogen cause Down syndrome?
no, it is caused by a triplication of the 21st chromosome.
Do Asians have down syndrome?
The answer is yes; any person of any race can have Down syndrome. Down syndrome is caused by a defect in the 21st pair of chromosomes.
Is Down syndrome contagious?
No, you cannot catch Down syndrome. Down syndrome is a condition, not a disease or an infection. It is a disorder of the chromosomes. It is something you are born with, and is caused by a genetic mutation of Chromosome 21.
