Originally Posted by
mountainmama
Lisa, I don't truly know the answer to your question, but I would take an educated guess and say yes, based on human facts. Trisomy 21-Down's Syndrome-is an extra 21st chromosome, but there are millions of genes that line up on those chromosomes, and the way that they line up determine the physical appearance and mental capacity of the patient. In humans, there is also something called "mosaics" of Down's patients, where they may appear to look like a Down's patient but not have the extra chromosome. The only true way to know if Beryl has Down's would be genetic testing...likely not feasable.
Just like in humans, I wouldn't think she would have to meet all of the criteria for Down's, but a certain percentage.
Hope this helps you make your determination.