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2021-05-17

What chromosomal condition causes Down syndrome?

What chromosomal condition causes Down syndrome?

Babies with Down syndrome have an extra copy of one of these chromosomes, chromosome 21. A medical term for having an extra copy of a chromosome is ‘trisomy. ‘ Down syndrome is also referred to as Trisomy 21.

What is the source of an extra chromosome in an individual with Down syndrome?

In the majority of cases, the extra copy of chromosome 21 comes from the mother in the egg. In a small percentage (less than 5%) of cases, the extra copy of chromosome 21 comes from the father through the sperm.

What stage of cell division does Down syndrome occur?

Down syndrome occurs when the nondisjunction occurs with Chromosome 21. Meiosis is a special type of cell division used to produce our sperm and egg cells. Meiosis produces genetically unique haploid cells, which contain one copy of each of the 23 chromosomes containing a unique mixture of maternal and paternal DNA.

What are the main causes of Down syndrome?

About 95 percent of the time, Down syndrome is caused by trisomy 21 — the person has three copies of chromosome 21, instead of the usual two copies, in all cells. This is caused by abnormal cell division during the development of the sperm cell or the egg cell.

Does Down syndrome affect age?

Adults with Down syndrome experience “accelerated aging,” meaning that they experience certain conditions and physical features that are common to typically aging adults at an earlier age than the general population.

What are the language and social interaction skills of a child with Down syndrome?

Children with Down syndrome have strengths in the area of vocabulary and pragmatics (social interactive language). They often develop a rich and varied vocabulary as they mature. They have good social interactive skills and use gestures and facial expressions effectively to help themselves communicate.

How does Down syndrome affect social and emotional development?

Older school age children and adolescents, as well as young adults with Down syndrome with better language and communication and cognitive skills presenting with increased vulnerability to: Depression, social withdrawal, diminished interests and coping skills. Generalized anxiety. Obsessive compulsive behaviors.

How do you interact with a child with Down syndrome?

Children with Down’s syndrome often need extra time to respond. Watch carefully, pause and wait when interacting with your child. It may take him longer to process what he sees and hears. It may also take him longer to respond by moving, gesturing, signing, vocalising or speaking.

How is Down syndrome diagnosed?

amniocentesis, a prenatal diagnosis method in which a needle is inserted into the amniotic sac that surrounds the fetus. Amniocentesis is most often used to detect Down syndrome and other chromosomal abnormalities. This test is usually done in the second trimester, after 15 weeks of gestation.

Can a woman with Down syndrome have a normal baby?

Women with Down syndrome are able to have children, but many men with the condition unfortunately are not able to, however it is possible. Women who have Down syndrome are able to have children; they have a 35-50% chance that their baby will have Down syndrome.