The Causes Of Down Syndrome Essay

1251 Words Dec 3rd, 2015 null Page
Causes of Down Syndrome
Many people do not know the causes of down syndrome and how many there are, but there is a total of three. Those three are complete trisomy 21, Mosaicism, and Translocation. The main cause of Down syndrome is complete trisomy 21. The other two causes are not as common. Another thing that people do not know about Down syndrome is that it is only inherited. It cannot have an environmental cause. The reason is it is caused by a malfunction in the process of making a human’s chromosomes. Down syndrome is a major problem that many people have to live with. A lot of people do not know that Down syndrome has three different causes.
The majority of background information on Down syndrome is the different types and its history. One article states that Down syndrome is a congenital condition caused by the presence of an additional copy of chromosome 21 in a person’s cells. This is also referred to as trisomy 21. Humans usually have 46 chromosomes in every cell, with 23 inherited from each parent. Due to the extra copy of chromosome 21, people with Down’s syndrome have 47 chromosomes in their cells. This additional DNA causes the physical characteristics and developmental problems associated with the syndrome. Down’s syndrome was first described by an English physician John Langdon Down in 1862, who helped to differentiate the condition from mental disability. He used the term “mongoloid” to describe the condition, due to his opinion that children with Down’s…

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