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Down syndrome is known as trisomy 21 because someone with the syndrome has 3 chromosomes of the same type when we are only supposed to have 2 (one from each parent). Chromosomes are paired and numbered so Down Syndrome is the result of having 3 of the #21 chromosome. The body will not know what to do with the extra chromosome so as a precautionary measure it will shut down all 3 and the genes that are within the chromosomes can no longer be accessed.
So as you can see, Down Syndrome is not from being inherited by a specific gene. It is due to an error in meiosis in either the mother or the father.
Wiki User
∙ 11y ago
Wiki User
∙ 12y agoDown syndrome is characterized by an extra copy of Chromosome 21.
For each chromosome, there are two copies, one from the mother, and one from the father. During meiosis the number is reduced to one set of chromosomes. People with Down syndrome have an extra copy of chromosome 21, or part of it.
Wiki User
∙ 15y agoIt occurs when a person has either an extra Y-chromosome, or an extra X-chromosome.
Wiki User
∙ 10y agoDown Syndrome chrildren are born with an extra Chromosome 21.
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Is there a specific gene for down syndrome?
No.
Why did evolution not occur in down syndrome?
Down Syndrome is a the addition of an extra chromosome and not really related to evolution. It is more of a genetic mutation that causes this event to occur.
Where on earth does Down Syndrome most occur?
The number is the same everywhere.
When does Down syndrome most often occur?
Down's syndrome is increased with advanced maternal age, which is defined as more than 35 years of age.
Is there any specific community that has a high percentage of people with Down syndrome?
No.
What age does down syndrome start to occur?
Down syndrome is something you are born with; it is not something that will suddenly "appear."
Is there any connection between Down syndrome and Bathmophobia?
First off, bathmophobia is the fear of deep places or looking into them. No, there is no association with Down syndrome and this specific phobia.
What are some statistics related to down syndrome?
Some of the conditions that occur more often among children with Down syndrome include: heart defects, vision problems and hearing loss.
What are the similarities and differences between Down syndrome and Turner syndrome?
Down syndrome is caused by an extra or part of an extra 21st chromosome while Turner syndrome is caused by an absence in one or part of the sex(X) chromosome.Down syndrome can occur in both male and femalewhile Turner syndrome only occurs in female.People with Down syndrome tend to have a lower than average cognitive ability.Both Down syndrome and Turner syndrome are at higher risk for having medical conditions such as heart problems.
What race does Down syndrome affect?
Down Syndrome affects all races. Down Syndrome does not affect all races evenly its affects Mexicans more than any one else. Hispanics have larger numbers of live births suffering from Down Syndrome because they do not terminate their DS pregnancies, like other races do.
Do Asians have down syndrome?
The answer is yes; any person of any race can have Down syndrome. Down syndrome is caused by a defect in the 21st pair of chromosomes.
If a child is born with down syndrome when did the mutation occur?
During meiosis
