What are the genetics of Trisomy 21? (autosomal, sex-linked, recessive, dominant, etc)? - trisomy 21 disjunction video
is an autosomal recessive sex-linked, dominant, etc.? is the separation or NGOs. in confused about everything. .
Friday, February 5, 2010
Trisomy 21 Disjunction Video What Are The Genetics Of Trisomy 21? (autosomal, Sex-linked, Recessive, Dominant, Etc)?
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What are the genetic changes to Down syndrome do?
Down syndrome is on chromosome 21 in combination.
Most cases of Down's syndrome, trisomy 21, which means that each body cell has three copies of chromosome 21 instead of the usual two copies. The additional genetic material changes over the course of normal development, what the characteristics of Down syndrome. Although the relationship between Down syndrome and Alzheimer's disease is unclear, researchers believe that an additional copy may declare a particular gene on chromosome 21 of the APP gene, the increased risk.
A small percentage of cases of Down syndrome occurs when only part of the cells of the body an extra copy of chromosome 21 have. These cases are called mosaic Down syndrome.
Although uncommon, the syndrome can also occur if there is a part of chromosome 21 attached (translocated) to another chromosome before or at conception. Affected individuals have two copies of chromosome 21 linked, and the additional material on chromosome 21 to another chromosome. These cases are used as trans -Location Down syndrome.
Down syndrome can be inherited?
Most cases of Down syndrome are not inherited, but occur) as random events during the formation of gametes (eggs and sperm. An error in cell division as nondisjunction results in reproductive cells of an abnormal number of chromosomes. For example, an egg or sperm cells can get an extra copy of chromosome 21 If any of these atypical reproductive cells contributes to the genetic makeup of a child, the child will have an extra 21st Chromosome in each cell of the body.
Mosaic Down syndrome is not hereditary. It appears as a random error in the first cell division in fetal development. Accordingly, some cells have two copies of chromosome 21 in general, and other cells have three copies of the chromosome.
Translocation Down syndrome can be inherited. A person who is interested in May carry a rearrangement of genetic material between chromosome 21 and another chromosome. This rearrangement is called a balanced translocation because there is no additional hardware from the Commission on Human Rightsomosome 21st Although no signs of Down syndrome are people who can provide this type of balanced translocation at increased risk for a child with the disease.
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