No
The proportion of men to women with Down syndrome is about equal.
An individual with Down Syndrome has the presence of all or part of an extra 21st chromosome.
1 in 10
I do not have real-time data to provide the name of the oldest female in the US with Down syndrome. You may be able to find this information through research or by contacting organizations that focus on Down syndrome advocacy and support.
Nationally, there are currently approximately 400,000 people with Down syndrome. Unfortunately, though, there is no breakdown on numbers for each state of those with Down syndrome.
If you look at the link below, the probability of a 28 year old female having a baby with Down syndrome is a little less than 1 in 1000.
Since Down syndrome isn't a sex-linked trait, it won't be passed down from parent to child, and it has nothing to do with the genetics of the previous generations. Getting Down syndrome happens by a "mess up" in reproduction, not from getting it from previous generations.
There are 22 pairs of chromosomes. You have the triple chromosomes at 21 position.
down syndrome
Disorders, such as Down's Syndrome, are caused by nondisjunction.
50%