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What condition does trisomy 21 cause?
Down syndrome (trisomy 21) is a genetic disorder. It includes certain birth defects, learning problems, and facial features. A child with Down syndrome also may have heart defects and problems with vision and hearing.
Is trisomy 21 a mental disorder?
Down syndrome (DS), or trisomy 21, is the most common identifiable genetic cause of mental retardation. The syndrome is unique with respect to its cognitive, behavioral, and psychiatric profiles.
What are the characteristics of an individual with trisomy 21?
Many characteristics of full trisomy 21 are quite noticeable—a round face and upturned eyes, and a short, stocky build, for example. People with Down syndrome sometimes move awkwardly, usually due to low muscle tone (hypotonia) at birth that can interfere with physical development.
Can a woman with Down syndrome have a normal baby?
Misconception: People who have Down syndrome cannot have children. Reality: It’s true that a person with Down syndrome may have significant challenges in rearing a child. But women who have Down syndrome are fertile and can give birth to children.
What is the difference between Down syndrome and trisomy 21?
Typically, a baby is born with 46 chromosomes. 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.
Can a Down syndrome person have a baby?
What does trisomy 21 cause?
Trisomy 21 results when a baby has three rather than the typical two copies of chromosome 21 in all of his or her cells. This type of abnormal cell division occurs during the development of the egg or sperm cell. Trisomy 21 is by far the most common cause of Down syndrome , as it occurs in more than 90 percent of cases.
Is trisomy 21 genetically inherited?
Also known as Down syndrome , trisomy 21 is a genetic condition caused by an extra chromosome. Most babies inherit 23 chromosomes from each parent, for a total of 46 chromosomes.
Who is at risk for Down syndrome?
Advanced maternal age is the only known risk factor for Down syndrome. The older the woman is when she delivers the infant, the higher the chances of having a child with Down syndrome. Couples who have had one child with Down syndrome are at a slightly increased risk (about 1%) for having another affected child.
What is chromosome 21 Down syndrome?
Down syndrome. Down syndrome is a chromosomal condition that is associated with intellectual disability, a characteristic facial appearance, and weak muscle tone ( hypotonia ) in infancy. This condition is most often caused by trisomy 21. Trisomy 21 means that each cell in the body has three copies of chromosome 21 instead of the usual two copies.