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Doctor insights on: Incidence Down Syndrome

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Is Down syndrome inherited?

Is Down syndrome inherited?

Not usually: The only way to inherit down syndrome is if one parent has down syndrome and passes 2 copies of chromosome 21. Few people with ds reproduce, so that is not usually a factor. ...Read more

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Incidence (Definition)

...That is a measure of the risk of developing some new condition within a certain period of time. The incidence rate is the # of new cases per population that develop a disease over a period of time. So, in a population of 100, if 5 people develop the disease within 5 years, the incidence rate is 5% over 5 years. Compare to 'prevalence', which measures the total # ...Read more


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Is down syndrome sex-linked or autosomal?

Is down syndrome sex-linked or autosomal?

Down Syndrome: Down syndrome, also known as Trisomy 21, is an autosomal genetic disorder. Down syndrome occurs when a person has a full or partial copy of chromosome 21. ...Read more

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Is down syndrome autosomal or sex linked?

Is down syndrome autosomal or sex linked?

None of the above: Down syndrome happens when an extra 21 chromosome is present in all the cells of the body. It happens before conception when the donor egg fails to shed one of its 21 chromosomes in the formation of the egg; the male 21 joins the female pair & creates an embryo with 3 number 21's. It has nothing to do with traits or mutations in the gene code. ...Read more

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How is Down syndrome inherited?

How is Down syndrome inherited?

Rarely: Downs syndrome is usually related to a trisomy defect that develops during the initial cleavage of the cells during primary fetal development. A form can occur as a translocation that may be carried by a parent. An assumption is that the 21 chromosome may be damaged by maternal age or by some environmental factor that then results in downs syndrome. Most cases are just by chance. ...Read more

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Down syndrome is autosomal dominat?

Down syndrome is autosomal dominat?

No autosomal: Down syndrome happens when an extra 21 chromosome is present in all the cells of the body. It happens before conception when the donor egg fails to shed one of its 21 chromosomes in the formation of the egg & the male 21 joins the female pair & creates an embryo with 3 number 21's. It has nothing to do with traits or mutations in the gene code. ...Read more

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Which type of chromosomal mutation causes down syndrome?

Which type of chromosomal mutation causes down syndrome?

Not mutation,number : Down syndrome is an abnormality of chromosome numbers, not a trait or mutation in the gene code. During conception only one of chromosome of each pair is given by both parents to the fertile egg.If a parent adds their 2 nbr 21chm to the other parents nbr 21, 3 end up in the egg ; the excess 21 causes the all the problems.Rare forms are causes by a extra piece of a 21, but that's another issue. ...Read more

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Is Down Syndrome a sex linked chromosomal disease?

Is Down Syndrome a sex linked chromosomal disease?

No: Down syndrome is an abnormality of chromosome numbers, not a mutation on a sex chromosome. During conception only one of chromosome of each pair is given by both parents to the fertile egg.If a parent adds their 2 # 21 chm to the other parents # 21, 3 end up in the egg ; the excess 21 causes the all the problems.Rare forms are causes by a extra piece of a 21, but that's another issue. ...Read more

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Which type of mutation causes down syndrome?

Which type of mutation causes down syndrome?

Trisomy 21: Down syndrome is also called trisomy 21. That means that there is a partial or complete third copy of the chromosome 21. It is the most common chromosomal abnormality. ...Read more

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What's the incidence of edward syndrome?

What's the incidence of edward syndrome?

One in 6,000: Edwards syndrome occurs in around one in 6, 000 live births and around 80 percent of those affected are female. The majority of fetuses with the syndrome die before birth. The incidence increases as the mother's age increases. The syndrome has a very low rate of survival, resulting from heart abnormalities, kidney malformations, and other internal organ disorders. ...Read more

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Is fragile x syndrome the same degree of retardation as down syndrome?

Is fragile x syndrome the same degree of retardation as down syndrome?

Variable: They are both "genetic" conditions but they are different in the spectrum of issues they present-. People with fragile x may have subtle cognitive impairments all depending on how affected the fmr1 gene is. People with downs have an extra chromosome and kids have delayed cognition as well as physical growth and frequently heart problems.. They both may exhibit autistic traits, more so fagile x. ...Read more

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Is Down syndrome dominant or recessive?

Neither: Down syndrome happens when an extra 21 chromosome is present in all the cells of the body. It happens before conception when the donor egg fails to shed one of its 21 chromosomes in the formation of the egg & the male 21 joins the female pair & creates an embryo with 3 number 21's. ...Read more

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Is Down syndrome sex linked/recessive/or dominant?

Is Down syndrome sex linked/recessive/or dominant?

None of the above: Down syndrome happens when an extra 21 chromosome is present in all the cells of the body. It happens before conception when the donor egg fails to shed one of its 21 chromosomes in the formation of the egg; the male 21 joins the female pair & creates an embryo with 3 number 21's. It has nothing to do with traits or mutations in the gene code. ...Read more

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What population is affected by down syndrome?

What population is affected by down syndrome?

Confusing question: Down syndrome is present in any racial, ethnic, social, economic or other group in any country in the world. It can occur to women giving birth at any age but is more common in older mothers. ...Read more

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Why is Down syndrome more maternally inherited?

Why is Down syndrome more maternally inherited?

It isn't...: Maternally inherited, unless the mother has down's syndrome. Inherited means it's passed from generation to generation. When down's occurs, the egg has two copies of chromosome 21 instead of the usual one copy, so when the egg is fertilized, it ends up with three copies instead of the usual two. This is a new event, not an inheritance. The risk of down's syndrome increases with maternal age. ...Read more

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Does Down syndrome increase your risk for leukemia?

Yes: Down syndrome unfortunately leads to an increased risk of acute myeloid (especially megakaryocytic) and acute lymphocytic leukemias. The risk of acute leukemia in the first 5 years of life is 56x higher than non-downs kids and overall, 1 in 150 downs patients develop leukemia. ...Read more

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Does teething cause down syndrome?

Does teething cause down syndrome?

Not at all: Down syndrome is a genetic disorder, you can only be born with it, teething has nothing to do with it , your baby is safe. ...Read more

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What are common conditions resulting from nondisjunction (ex. Down syndrome)?

See below: There are multiple more common nondisjunction syndromes like down's syndrome (trisomy 21) including: trisomies 18, 13, 8, 9, 16 and monosomies like: chromosome 7 or turner's syndrome - monosomy x. But nondisjunction can happen to any of the chromosomes. The most recognized are down's syndrome and turner's syndrome. Most others are not compatible with life. ...Read more

Dr. Kathryn Akin
654 doctors shared insights

Down Syndrome (Definition)

A genetic chromosome 21 disorder causing ...Read more