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No. Parents who have a child with Down syndrome do not have an increased chance in having another child with Down syndrome. Everyone has the same chance of having a child with Down syndrome, 1%.
If one of the parents has Noonan syndrome the chance of having a child with NS is 50%. If neither parent has Noonan syndrome the chance of having a child with NS is 1 in 1,000.
There is no way to be absolutely positive that your child will not have Morquio's syndrome if both parents have the gene, but there are genetic screenings to help prevent having a child with Morquio's syndrome.
A child with Asperger's Syndrome can be a child with a high IQ. People with Asperger's Syndrome typically have average to high IQs.
After having one child with Down Syndrome, the likelihood of having another is about one percent. If the first child's Down Syndrome is due to translocation trisomy 21, the likelihood of another Down Syndrome child increases. As far as researchers know at this point, Down Syndrome is not attributed to the parents' behavior prior and/or during pregnancy or any environmental factors. The incidence of Down Syndrome does rise if the mother is older than 35, but it does not account for a large number of Down Syndrome children. Since more women are having children at ages younger than 35, then number of babies born with the syndrome is higher in younger age groups.
There is a 100% probability of his child having Marfan's syndrome. The syndrome is carried by the FBN1 gene, and is dominant so there is no way to avoid having the disease. However the severity of it may vary from mild to severe, so his child may suffer from a mild form of the syndrome.
For the United States, estimated as the fraction of people in the population with the syndrome, ~1/5500.
No.
It depends if he gets marry to a female suffering from morquio syndrome then in this case each child will have 50% chance of having morquio the other side if he marries with normal female then non of his child will suffer from morquio syndrome, but there will be 25% chance that the child carry morquio syndrome gene.
That depends. Men with Down syndrome have been shown to be sterile, while women with Down syndrome are capable of carrying a child, with 50% likelihood that the child will be born with Down syndrome.
A pregnant woman with Marfan should also receive genetic counseling regarding the 50% risk of having a child with the syndrome.
When she was a child, Temple Grandin was diagnosed as having autism. If she were being diagnosed today, it would probably be labeled Asperger's Syndrome.