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Doctor insights on: Mode Of Inheritance Of Down Syndrome

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Can you please define Down syndrome inheritance pattern?

Can you please define Down syndrome inheritance pattern?

There is none: You do not inherit ds from your parents in the traditional dominant or recessive fashion. During formation of the egg, only one of a pair of the 23 separate chromosomes is present so the sperm bringing 23 will reestablish the 46. Ds occurs when an extra 21 (or piece of a 21) is present in the egg after conception. This is a chromosome number change, not an inherited trait. ...Read more

Dr. Kathryn Akin
654 Doctors shared insights

Down Syndrome (Definition)

A genetic chromosome 21 disorder causing ...Read more


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What is down syndrome?

What is down syndrome?

Chromosome defect: Ds is one of the more common chromosome (c) defects that can survive pregnancy (many others miscarry).Eggs are supposed to have a single 21c & combine with the 21 from dads normal sperm.Here a pair of moms 21c +dad's 21 creates a baby with the extra 21c in all tissues. This extra material confuses the creation of body parts causing ds. Various prenatal tests can pick up signs early on. ...Read more

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What causes down syndrome?

What causes down syndrome?

DNA defects: Chromosome 21 seems to be the cause. Two most common types are trisomy 21 where ther is an entire extra chromosome in each cell. The other is translocation where only an extra piece of the chromosome is found. It can be an isolated defect or an inherited defect. Rare exotic forms include polyploidy and haploid forms and chimeras. Sorry you asked? ...Read more

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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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How is down syndrome treated?

How is down syndrome treated?

Medical/education: Children with Downs Syndrome have special medical and educational needs that should be determined in each individual. Doctors and Psychologists or educational specialists can determine what the needs are and how best to meet them. ...Read more

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Why is my baby down syndrome?

Why is my baby down syndrome?

Chromosome defect: Ds is one of the more common chromosome (c) defects that can survive pregnancy (many others miscarry).Eggs are supposed to have a single 21c & combine with the 21 from dads normal sperm.In ds the pair of moms 21c +dad's 21 creates a baby with the three 21c in all tissues. This extra material confuses the creation of body parts causing ds. Various prenatal tests can pick up signs early on. ...Read more

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How is Down syndrome treated?

Down syndrome: Down's syndrome may be detected before birth (prenatally) or after birth (postnatally). It cannot be cured but treatment and support can help someone with Down's syndrome to lead an active life. A number of advice and support groups are available for people with Down's syndrome and their families and carers. ...Read more

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Why does Down syndrome happen?

Mistake in chromosom: During the formation of normal eggs or sperm the chromosome (c) pairs are supposed to split leaving one of each in the egg/sperm. At conception the joining of egg/sperm brings together the pair & as tissue grows it has the proper number in each cell. With ds the egg has a pair of 21c and at conception a triple 21 is created. All cells derived after will have an extra 21 & become a ds child. ...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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How can you inherit down syndrome?

Depends on parents: An unaffected mother or father could have a balanced (normal) set of chromasome material where a piece of one 21 chromasome is stuck on another. If the egg or sperm had the normal 21 and an extra 21piece hidden on another chromasome, they could pass it to the baby. It only takes an extra piece of 21 to cause ds. It is important to study ds to verify type, as translocation ds can recur each pregnany. ...Read more

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How do you diagnose down syndrome?

Karyoytype.: Dna analysis or karyotype is diagnostic of Down syndrome both prenatally and postnatally. ...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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How does a person get down syndrome?

Chromosomal abnormal: Down syndrome is caused be a chromosomal abnormality tha occurs at the time of fertilization. It is usually associated with the fertilization of an egg carrying2 number 21 chromosomes. ...Read more

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Is it possible to catch down syndrome?

Is it possible to catch down syndrome?

Down syndrome: Down syndrome is not an infection, it is a genetic chromosome problem. Someone with Down's syndrome has an extra copy of chromosome 21 in the cells of their body. You cannot catch it from someone. ...Read more

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What are the symptoms of down syndrome?

See below: Flat face, hypotonia, and intellectual disability. One third of patients develop congenital heart defect (s). ...Read more

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What are the problems of down syndrome?

Many: Increased incidence of congenital heart disease, gastrointestinal problems such as atresia and hirschsprung's, nutrition with gasroesophageal reflux and aspiration, hypo or hyperthyroidism, and neurologic; mental retardation, joint laxity and hypotonia. Some Down syndrome have few problems, and some many problems. ...Read more

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How do Down syndrome & mongloid differ?

How do Down syndrome & mongloid differ?

Old world term: Before the chromosome defect was found in '60's, the the facial structure of Down syndrome kids/adults, reminded folks of the features of mongolian race. Original scientific publications used that terminology. It was well into the '70's before the descriptions began to change ; the public began to use the term Down syndrome exclusively. ...Read more

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How long do Down syndrome children live?

How long do Down syndrome children live?

Variable: They do die relatively young in the 20s and 30s but they thrive on love just the same as normal kids and their death is unpredictable. ...Read more

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How to tell if a baby has down syndrome?

How to tell if a baby has down syndrome?

Before/after birth?: There are a variety of screening or confirmatory tests that can be done during pregnancy. After birth, many physical features are suggestive of the diagnosis, but the physician involved would order a chromosome test to confirm or exclude the issue. Over the years, some had signs so mild many would miss the diagnosis. Others looked so different I didn't believe it. ...Read more