write short note on down syndrome
Answers
Answered by
7
Down syndrome is a chromosomal disorder caused when an error in cell division results in an extra 21st chromosome.
There can be impairments in cognitive ability and physical growth, mild to moderate developmental disabilities, and a higher risk of some health problems.
Through a series of screenings and tests, Down syndrome can be detected before or after birth.
The likelihood having Down syndrome is around 1 in every 700 pregnancies. It is determined by many factors, but research suggests there is a higher risk if the mother delivers at over 35 years of age.
Before the age of 30 years, fewer than one in 1,000 pregnancies will be affected by Down syndrome. After the age of 40 years, this figure rises to about 12 in 1,000.
Answered by
6
↔The most common form of Down syndromeis known as trisomy 21, a condition where individuals have 47 chromosomes in each cell instead of 46. Trisomy 21 is caused by an error in cell division called nondisjunction. This leaves a sperm or egg cell with an extra copy of chromosome 21 before or at conception.
↔Down syndrome is usually caused by an error in cell division called “nondisjunction.” Nondisjunction results in an embryo with three copies of chromosome 21 instead of the usual two. Prior to or at conception, a pair of 21st chromosomes in either the sperm or the egg fails to separate.
↔Down syndrome (DS or DNS), also known as trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. It is typically associated with physical growth delays, mild to moderate intellectual disability, and characteristic facial features. ... There is no cure for Down syndrome.
Causes: Third copy of chromosome 21
Deaths: 26,500 (2015)
Treatment: Educational support, sheltered work environment
Frequency: 5.4 million (0.1%)
↔Down syndrome is usually caused by an error in cell division called “nondisjunction.” Nondisjunction results in an embryo with three copies of chromosome 21 instead of the usual two. Prior to or at conception, a pair of 21st chromosomes in either the sperm or the egg fails to separate.
↔Down syndrome (DS or DNS), also known as trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. It is typically associated with physical growth delays, mild to moderate intellectual disability, and characteristic facial features. ... There is no cure for Down syndrome.
Causes: Third copy of chromosome 21
Deaths: 26,500 (2015)
Treatment: Educational support, sheltered work environment
Frequency: 5.4 million (0.1%)
Similar questions