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It's either a mutation with the gene, or either the mother or father donates an extra chromosome.

2nd Answer:

True, and Down syndrome is not a genetic disease and has nothing to do with family history.

By the way, the kind of chromosomal mistake that causes Down Syndrome occurs in many people, but on different chromosomes. Mostly, your body is so tolerant of this kind of mistake that you never see any results.

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Q: How does Down syndrome occur with no history of Down syndrome in the family history?
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What family risk factors are there?

having a family history of AD, Down syndrome, or Parkinson's disease


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.


Should you worry about the results of your amniocentesis if nobody in your or your husband's family has Down syndrome?

Yes! Down Syndrome is not a genetic disease. ANYBODY can be born with Down Syndrome, even if 100 or 0 people in their family have it.


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.


How do people get morquio syndrome?

both parents with a family history of the disease pass a defective gene to the child before they are born


What age does down syndrome start to occur?

Down syndrome is something you are born with; it is not something that will suddenly "appear."


Can you still donate your eggs with a partial hysterectomy and one ovary?

If you have no history of birth defects in your family, such as Down Syndrome, and your eggs are free of inflictions, then yes, most likely.


Is it advisable to have a test for amniocentesis if there is no history of Down syndrome either in your own family or in your husband's family?

I've always heard that you should not get an amniocentesis in this case. There is a chance it could damage the baby. I've had 3 children and I wouldn't do it unless there was a history of something serious.


What can be done for down syndrome?

It could be possible to live a normal life if you have Down Syndrome if you get alot of support from family, friends, anyone close to you really


Can family history of kids with down syndrome increase the risk to have a kid with down syndrome?

yes. if that is true, then that means that down syndrome is genetic in yourfamily. try researching it up. look it up on google. i highly reccomend wikepedia.the more you know, the more able you will be to understand these poor kids.allison386Calling them "poor kids" is offensive. Down syndrome is a relatively common, and random, genetic variation--unless it is of the translocation type, which is a lot less common and is heritable.


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.