There are 22 pairs of chromosomes. You have the triple chromosomes at 21 position.
23
It will result 4n cells.Chromosomal number will be doubled from generation to generation. It also will result in abnormal individuals that may not to be able to adapt. Down's Syndrome and Turner's Syndrome are examples of this.
no and waverer some kids have down syndrome
The proportion of men to women with Down syndrome is about equal.
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.
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.
#21
Yes, a female with Down syndrome has three copies of chromosome 21, but only two copies of the X chromosome. Regarding sex chromosomes, she is genetically normal. For this reason X chromosome inactivation would occur, and she would have one Barr body per cell.
An individual with Down Syndrome has the presence of all or part of an extra 21st chromosome.
Yes.
The number is the same everywhere.