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Most commonly it is caused by "non-disjunction".
The cells in the body usually have two of each chromosome (one from each parent). The sperm and egg each have only one of each chromosome so when they are formed the pairs of chromosomes line up next to each other and then normally one of each set is sent to each of the daugher cells. Occasionally, the two will stick together and both copies will go to the same cell (and the other cell will have no copy of that chromosome).
When a sperm or egg (usually the egg) with two copies of chromosome 21 combine with a sperm or egg with one copy the resulting cell has three copies - or trisomy 21.
There are, less common, ways it can happen.
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∙ 12y ago
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∙ 13y agoWiki User
∙ 13y agotrisomy 21 is down syndrome.
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∙ 13y agogene mutation
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What is trisomy 13
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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 is Trisomy?
A trisomy is a condition in which a person has three copies of a chromosome instead of the usual two copies. Trisomy 9 refers to three copies of chromosome 9. A person can have full trisomy 9 (three copies in every cell) or mosaic trisomy 9 (three copies in some cells but not all).
What is the possible way to cure genetic disorder?
currently there are no treatments for genetic disorders
What are symmetric basal ganglia calcifications?
Basal ganglia calcification, also known as Fahr disease, is a rare genetically dominant, inherited neurological disorder characterized by abnormal deposits of calcium in areas of the brain that control movement.Build-up in your basal ganglia can also happen because of infection, problems with your parathyroid gland, and for other reasons. When it happens this way, it is also known as basal ganglia calcification, but is different from the genetic form of the disease.
What is it called when there's a change in the gene?
The change of genetic information within an organism is known as a genetic mutation. It may also be refereed to as a change in allele frequencies when populations are examined.
Can Down syndrome be prevented?
Downs Syndrome, also known as trisomy 21, is a chromosomal disorder and, as such, cannot be avoided nor prevented.
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.
Is Hunter Syndrome and Huntington's Chorea the same?
No, Hunter Syndrome (also known as Mucopolysaccharidosis type II) is a rare genetic disorder that affects metabolism. It is caused by the lack of an enzyme in the body. On the other hand, Huntington's chorea (also known as Huntington's disease) is a different genetic disorder that affects the brain, leading to movement, cognitive, and psychiatric symptoms. While both are genetic disorders, they affect different systems in the body.
Is being Deaf a genetic disorder?
Yes it is! but it also can be developed on his own!
What is the scientific name for Down syndrome?
The scientific name for Down syndrome is Trisomy 21, referring to the presence of an extra copy of chromosome 21 in each cell.
What is a blood disorder also known as cooley's anemia?
Thalassemis is a blood disorder also known as cooley's anemia. It is also known as Mediterranean anemia.
In humans the risk of passing on a genetic disorder to offspring can be assessed by?
You could make a pedigree which could identify carriers of a genetic disorder and individuals with the disorder. You could do blood tests to determine whether a person carries a gene for a particular genetic disorder. You could make a karyotype to determine whether there are any chromosomal abnormalities.
What is the genetic disorder that causes excessive hair growth?
Hypertrichosis very rare disorder also called werewolf syndrome.
Is Down syndrome also known as Monosomy 21?
No, that is false. Down Syndrome is also known as Trisomy-21. Monosomy is a condition where one chromosome is missing from what should be a pair in every cell throughout the body. Trisomy indicates a chromosome has three copies instead of a pair.
Difference between thalassemia and sickle cell anemia?
Thalassemia is a genetic disorder as a result of an imbalance in the hemoglobin. In sickle cell, also a genetic disorder, the mutation cause a crescent shaped molecule.
What is the clinical description of cystic fibrosis?
Wikipedia defines it as follows... Cystic fibrosis (CF), also known as mucoviscidosis, is a genetic disorder that affects mostly the lungs but also the pancreas, liver,kidneys, and intestine.
What are some diseases to the muscular system?
A disease, also known as pathology, is any abnormal condition. These include injuries like strains, which can range from mild to severe that requires a trip to the ER. Lack of use and malnutrition can lead to atrophy. Spasticity could be a disorder of the nervous system. The disorder known as Duchenne muscular dystrophy is caused by a genetic disorder.
