Down Syndrome: A Genetic Disease In The US

Down syndrome is named after Dr. J.L. Down, who first discovered and studied the condition. It is part of a large number of disabilities known as intellectual disabilities. Down syndrome is present at birth and individuals are usually diagnosed during pregnancy or shortly after birth. There are three types of Down syndrome. The most common of these involves an extra number 21 chromosome, which gives the individual 47 instead of 46 total chromosomes. A chromosome breaking and then reattaching to another chromosome characterizes translocation, which is the second type of Down syndrome. The third type, nondisjunction occurs when a pair of chromosomes fail to separate properly during nuclear division. Individuals with this disability usually

Down syndrome is a congenital disorder resulting from a chromosome defect. Down syndrome affects people of all ages, race, and economic status. It causes an increased risk of health problems and developmental issues. Researchers have found that centuries ago there were people who seemed to depict the same features of those with Down syndrome today. In 1866, John Langdon Down was the first to identify Down syndrome as a disorder. Before he described it as a disorder, those with Down syndrome were killed, abandoned, or excluded from society. Many were also institutionalized and received improper treatment because of the uncertainty of the disorder. In 1959, the French physician Jérôme Lejeune identified Down syndrome as a chromosomal condition. Instead of the usual 46 chromosomes present in each cell, Lejeune observed 47 in the cells of individuals with Down syndrome.

Down syndrome is a genetic disorder that numerous individuals around the world suffer from; it is an intellectual disability that is caused by having one too many chromosome 21 copies, trisomy 21. The average person has two copies of chromosome 21 in each cell, whereas, an individual with Down syndrome has an extra copy of chromosome 21. This happens when either the sperm or egg cell undergoes atypical cell division during development. In the United States, there are approximately 400,000 individuals who have been diagnosed with Down syndrome, according to the last census in 2012 (National Down Syndrome Society).

Trisomy 21 is a disorder that is also considered a chromosomal abnormality because it has an extra chromosome added. This causes the abnormality to have Down syndrome. Like in most cases of Down syndrome are not inherited. When the condition is caused by trisomy 21, the chromosomal abnormality occurs as a random event during the formation of reproduction cells in a parent. The abnormality usually occurs in egg cells, but it occasionally occurs in sperm cells.

Down Syndrome (otherwise called Trisomy 21) is the most widely recognized hereditary issues that causes a long lasting scholarly disability, formative postponements and different issues. Down Syndrome influences individuals of any age, races, and financial levels. It is a standout amongst the most as often as possible happening chromosomal variations from the norm, happening once in each 800 to 1000 live births. More than 350, 000 individuals in the United States alone have Down Syndrome. My objective for this paper is to discuss the three unique sorts of Down Syndrome and to discuss the contrasts between them.

Down Syndrome is a genetic disorder that causes a range of physical disorders and developmental delays. It can be identified by some of the physical attributes the disorder comes with. These include a single deep crease across the palm of the hand, slightly flattened facial profile, and an upward slant to the eyes. To confirm the diagnoses doctors run a karyotype, which is a chromosomal analysis. They do this by extracting a blood sample and grouping chromosomes by size, number and shape.

Down syndrome is a disease in which chromosome 21 has extra genetic material delaying the way a child develops mentally and physically.

There are 3 types of Downs syndrome, translocation; standard trisomy 21 and mosaicism. Translocation is caused when a piece of chromosome 21 is located on another chromosome such as chromosome 14. The person with Translocation Trisomy 21 will have 46 chromosomes but will have the genetic material of 47 chromosomes. The person with Translocation Trisomy 21 will exhibit all the same characteristics of a person with Standard Trisomy 21 since they have three copies of chromosome 21. Translocation occurs between 3% and 5% of cases of Down syndrome. Standard trisomy 21 is the most frequent form of downs syndrome. Those affected by trisomy 21 will have 47 chromosomes in every cell as opposed to 46 like normal. Mosaicism is similar to standard trisomy

In Down syndrome, a person most often inherits two copies of chromosome 21 from the mother and one chromosome 21 from the father for a total of three chromosomes 21. If a baby inherits the chromosome with the extra genes from chromosome 21, then the child will have Down syndrome. About 2% to 4% of people with Down syndrome inherit additional genes from chromosome 21, but not in every cell of the body. These individuals may, for example, have inherited extra genes from chromosome 21 in their bone marrow causing an abnormal increase rate of blood cell production which is the cause of Leukemia Cancer. (Schainman 36)

Down syndrome a mistake in the cell division called non-disjunction. Two other minor types of chromosomal abnormalities, “mosaicism” and “translocation”, are also causes of Down syndrome. Mosaicism is the state of being composed of cells of two genetically different types. Translocation is the exchange

Down syndrome is a genetic defect attributed to an abnormality of the human chromosome 21. The National Down Syndrome Society (NDSS), a national advocate organization for the value, acceptance and inclusion of people with Down syndrome, notes that modern research has successfully identified three types of Down syndrome. The NDSS reports that Nondisjunction Trisomy 21, in which there are three copies of chromosome 21 instead of two, is the most common type of Down syndrome. Prior to or at the point of conception, a pair of 21st chromosomes in either the

Down syndrome (trisomy 21) is a chromosomal abnormality - change in the number of chromosomes, which lead to physical or mental abnormalities - caused by an error in cell division that is a result of having an extra 21st chromosome. 95% of the time the trisomy is mainly due to an abnormality of the egg of a mother, during fertilisation the 23 chromosomes from

Down syndrome occurs due to a change in the chromosome number. Instead of having forty-six chromosomes, people with Down syndrome have forty-seven.

Down syndrome is characterized as a chronic genetic chromosomal disorder which alters one’s cognitive growth, intellectual development, and physical characteristics. This extremely widespread condition is most prominently existent in human beings whose genetic makeup is composed of an additional copy of chromosome 21. Additionally, these human beings are known for acquiring 47 chromosomes rather than the conventional 46 chromosomes. This chromosomal abnormality is extremely common, yet highly spontaneous. To illustrate, the prevalence of Down Syndrome is exhibited as around

Typically, the nucleus of each cell stores forty-six chromosomes. Half of these chromosomes derive from each parent cell. However, in those with Down syndrome, the cells contain forty-seven chromosomes. Researchers’ knowledge of the etiology of Down syndrome has grown since it was first described in 1866 by John Langon Down (National Down Syndrome Society, 2012). According to the National Down Syndrome Association (2012), 95% of the Down syndrome cases are caused by a fault in cell division. Although it is clear that this disorder occurs because of an alteration during cell division, the cause as to why this occurs is unknown. However, the pathogenesis of this disorder is clear. The pathogenesis of this disorder begins with nondisjunction during meiosis, which is failure of the chromosomes to separate. Today, it is known that there