Usually when the egg or sperm are forming they split so that only one chromosome is in the egg or sperm, but in trisomy 21 they don't split causing the individual to have more chromosomes then they need. .
In the second form, translocation, which occurs in about three or four percent of Downs cases an extra part of chromosome number 21 joins with another chromosome. In half of Downs cases with translocation one of the parents" caries an extra 21st chromosome in a balanced or hidden form. .
In the third form, mosaic, the individual with Downs has an extra 21st chromosome only in some of the cells. This however, is extremely rare and only affects about 2% of the Downs cases. .
The odds of having a child with DS are various. Anywhere from 1 in 800 live births to 1 in 1100 live births. There is no greater chance of having a child with Downs associated with particular race, culture or geographic region. In recent studies, however, it has been proven that most Downs Syndrome cases are associated to a mother's age. The odds of having a child with Downs Syndrome increases as the age of the mother increases in which she reproduces. A mother who is 25 has about a 1 in 1400, 35 is a 1 in 350, but as the mother reaches 40 her chances increase to about 1 in every 100 live births. Another factor is if the parent already has Trisomy 21 it is 1 in 100 at any age. .
The chances of a woman with Downs Syndrome becoming pregnant is about 50%, however, most males are sterile and can't have children. In history there is one story of a man producing a pregnancy and the mother had Downs Syndrome as well. The Pregnancy miscarried about halfway through. .
While Downs Syndrome can't be cured or outgrown in any way providing good medical care can modify the affects. None of the following treatments have been proven 100% affective, many people have said that they help them a little, but some also belief that this is because they have a positive outlook because there may be some hope.
In children with Downs, there is a high rate of Leukemia. ... The third kind of Downs syndrome is called Mosaicism. ... These are a wide variation in people with Downs. ... We had two men and one woman who had Downs. ... Most adults with Downs syndrome will need some help daily activties. ...
Down Syndrome Down Syndrome is the most common genetic disorder. Down syndrome affects people of all ages, races, and economic levels. ... Women with Down syndrome can and do have children. ... Men with Down syndrome are believed to be sterile. ... Today researchers are following Down syndrome much more closely as they learn more and more about the genetics and other aspects of Down syndrome. ...
Down Syndrome Down syndrome is a form of Mental retardation and is usually detected by a doctor, after birth if a newborn shows signs of the physical characteristics that go along with the illness. ... The original name for Down syndrome, or Down's syndrome was/is "Mongolism," because people that are affected by this syndrome tend to look like Mongolians or people with facial abnormalities. Until 1959, the cause of Down syndrome was unknown. ... People that have Down syndrome usually have symptoms indicating that there is something wrong with them, such as looking like a Mongolian...
Those with Down syndrome mostly all have the same physical features. ... Down started studying the syndrome, he and his wife started growing a compassion for those with Down syndrome. ... The Downs had decided to open an asylum for the Down syndrome but it was private. ... Down syndrome was looked as a crime and seemed as it was not right. It had been unfair for those because people who had Down syndrome had no fault for them having the syndrome. ...
Down syndrome is a condition affecting many Americans and individuals across the world. ... Strides have been made in Down syndrome awareness, education and overall acceptance. ... Down syndrome is a condition that a person is born with. ... There are many physical problems associated with Down syndrome. ... Children with Down syndrome now attend public schools. ...
In order to understand Down Syndrome, one must examine genetics of a "normal" person as well as a person with Down Syndrome. ... In the case of a person with Down syndrome, there are 47 chromosomes. ... People with Down syndrome just want to be like every one else. ... Down syndrome is caused very early in the development of the fetus. ... It is 99.8% reliable in testing for Down syndrome. ...
In 1960, the name was changed to Down's Syndrome and 10 years later in the 70's American Scientist's changed the name to Down Syndrome. One in every 800 to 1,000 children is born with Down Syndrome. ... Low levels signal an increased risk for Down Syndrome. ... Another type of Down Syndrome is Mosaicism. ... Incidence of Down Syndrome and Maternal age Down Syndrome affects people of all races, social and economic levels. ...
Seeing a person with Down syndrome brings about different feelings in everyone. ... Down syndrome is the most commonly occurring genetic condition. ... Children with Down syndrome learn to sit, walk, talk, play, toilet train and do most other activities; only somewhat later than their peers without Down syndrome. ... Unlike other mental handicaps, Down syndrome is purely genetic. ... Resent additions to PL 94-142 have created a variety of new classrooms for students with Downs syndrome and other mental disabilities. ...
This is evident in Downs Syndrome and Turner Syndrome. Downs Syndrome is a case of trisomy in chromosome pair 21 due to disjunction. ... Turner syndrome is an example of a monosomy, the presence of only one particular type of chromosome. ...