Down Syndrome In Children

Also known as Trisomy 21, Down Syndrome is an illness due to which an superfluous genetic structure leads to delays in the manner in which a child’s mental and physical faculties develop.

When a baby is conceived, the baby receives 23 chromosomes from each parent, equaling 46 chromosomes. Sometimes during this creation a sperm or egg cell can causes that cell to contain 24 chromosomes. When this abnormal cell is included in the conception of a baby, that baby will have 47 chromosomes. The extra chromosome causes Down syndrome. After fertilization; cells start to divide rapidly. Depending on how the cell divides determines what type of Down syndrome the child has. Mosaic Down syndrome is obtained when a cell divides abnormally, creating a string of cells with the extra chromosome. A child with Mosaic Down syndrome has both cells: the normal 46 chromosomes, and the Down syndrome 47 chromosomes. It is believed that babies with Mosaic Down syndrome experience mild symptoms of the disorder.

Down Syndrome is also known as Trisomy 21, is a disorder that occurs when an extra chromosome is present on the 21st chromosome. There

This disorder cannot be cured, but there has been improvements in life to make it easier to live with such as at schools in most states it is required to let them go to public schools and some states even require schools to have an optional program just for Down syndrome and other mentally disabled people. There are also not any environmental factors that contribute to downs syndrome but as I said before, being older than 35 strongly increases odds of having a child with Down

There are 23 pairs of chromosomes in a normal human cell. Trisomy 21 or Down syndrome occurs when there is a third copy of chromosome 21 and causes malformation in body and brain development. Giving birth to a child with down syndrome increases as the mother ages. The odds of having a child with trisomy 21 are 1 in 1000 for women under the age of 35. This increases to 1 in 200 for women 35 and older. Thus, while not completely avoidable, it is best to have children while the mother is still under 35 to allow the child to be less likely to be born with down syndrome.

Down syndrome is a genetic disorder that begins to develop at the cellular level after conception. All the cells in the human body contain a center, called a nucleus, in which genetic code of each human being is stored. This genetic material, known as genes, carries the codes responsible for all our inherited characteristics from the mother and the father. Genes are grouped along rod-like structures called chromosomes. The nucleus of each cell normally contains 23 pairs of chromosomes, half of which come from each parent. In Down syndrome, however, the cells usually contain not 46, but 47 chromosomes. The extra chromosome being a number 21. This excess genetic material, in the form of additional genes along the 21st chromosome, results in Down syndrome. Ninety-five percent of all cases of Down syndrome occur because there are three copies of the 21st chromosome; it is often referred to as "trisomy 21." Chromosomes are studied by examining blood or tissue cells. Individual chromosomes are identified, stained and numbered from largest to smallest. The visual display of the chromosomes is known as a “karyotype”. (Karyotype is the analysis of counting the chromosomes in each cell)

Down syndrome is commonly known by the public as a disease that causes physical and mental disabilities in people. Down syndrome is known by the scientific community as a genetic disorder of the twenty-first chromosome. As a result of this genetic disorder other systems of the body are also affected, this includes mental and physical disabilities. Down syndrome “is a lifelong condition… that happens before birth” (WebMD, 2015). According to the National Down Syndrome Society one in every 691 babies are born with the condition (NDSS, 2015). In order to understand this condition it is

Around 5300 babies with Down syndrome are born in the United States each year, and approximately 200,000 people in this country have the condition. (de Graaf G, Buckley F, Skotko BG, 2016). While Down syndrome cannot be inherited, the number of babies with Down syndrome born each year is alarming. Despite the fact that Down syndrome can be detected before birth, there is no known way to cure it. As such, the parents whose child have been diagnosed to have Down syndrome have to decide whether to keep the child or not.

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

The chromosome affected by Down syndrome is chromosome 21. Chromosome 21 is twenty first pair of chromosomes in which are a part of the twenty three pairs of chromosomes found in human beings. People normally have two copies of this chromosome. The trisomy of the twenty first chromosome causes Down Syndrome. The chromosome is defected because instead of two

Trisomy 21 is caused by an error in cell division which is called nondisjunction. Nondisjunction results when the embryo gets three copies of chromosome 21 instead of two. This usually occurs at or prior to conception, a pair of 21st chromosomes in either the sperm or the eggs fails to separate. Since this occurs so early on, the extra chromosome is then replicated in every cell of the body. This type of Down syndrome accounts for 95% of cases (“What”). Translocation accounts for about 4% of cases. In this types the total number of chromosomes in the cells remain 46, but an additional full or partial copy of chromosome 21 attaches to another chromosome (usually 14). The presence of the extra full or partial chromosome 21 causes the characteristics of Down syndrome (“What”). Mosaicism or mosaic Down syndrome is a mixture of the two other types. It is characterized by a mixture of two types of cells, some containing the usual 46 chromosomes and some containing 47. The cells that do contain 47 chromosomes contain an extra chromosome 21. This type accounts for only 1% of all the cases of Down syndrome. Some research has shown that individuals with mosaic Down syndrome may have fewer characteristics of Down syndrome that those with other types

Down Syndrome, also known a Trisomy 21, is the most common cause of Mental deficiency that occurs from childbirth. Down syndrome is a genetic disorder that occurs when there is an extra chromosome Present. The presence of an extra chromosome causes this genetic disorder because chromosomes contain all of our genetic information and when this information is disrupted during cell division for example, when one is conceived with an added chromosome this causes many problems with the coding of the DNA. down syndrome occurs during cell division in early fetal stages. usually one inherits 23 chromosomes from each parent but in some cases people inherit an extra chromosome and receive three sets of chromosome 21, this is when the genetic disorder

Nondisjunction is the error in cell division that usually causes Down syndrome. Nondisjunction causes an embryo to have three copies of chromosome 21 instead of the usual two. Sometime prior to, or at conception, a pair of number 21 chromosomes, either in the sperm or the egg, fail to separate. Trisomy 21 happens in the egg 95 percent of cases and in the sperm only five percent. The extra chromosome replicates in every cell of the body as the embryo develops. Trisomy 21 accounts for about 95% of cases.

Some major causes are, error in cell division, they might have 47 chromosomes instead of 46 in their DNA. The reason that there would be an extra cell is called (non dis conjunction). 90% of the time down syndrome comes from the mother and 10% of the time it comes from the father.

Down syndrome is a genetic disorder in which a person is born with an extra copy of chromosome 21. There are three genetic variations that cause Down syndrome: Trisomy 21, Mosaic Trisomy 21 or Translocation Trisomy 21. There are many ways in which theses disorders affect the body.  Trisomy 21 occurs when an egg or sperm comes in with an extra copy of chromosome 21, then, once an embryo is formed and starts to develop, the chromosome is replicated in every single cell of the embryo. Trisomy 21 is the most common type of Down syndrome. About 92% of Down syndrome patients have this type. People with Trisomy usually have physical problems.