2
no because since they both have down syndrome, they will have 100 percent that they will have a down syndrome baby
100 million people
chromosome translocation got it right from study island if that is what you are using it for. good luck on future questions
down syndrome
Causes of Klinefelter SyndromeThe additional sex chromosomes in men with Klinefelter syndrome results from nondisjunction during meiosis and may have a paternal (50 to 60 percent) or maternal (40 to 50 percent) origin. This contrasts with Down syndrome, which is caused predominantly by maternal nondisjunction and inheritance of the extra chromosome 21 from the mother.
Disorders, such as Down's Syndrome, are caused by nondisjunction.
Down syndrome
Down syndrome is generally the preferred spelling, although Down's syndrome is sometimes used in American sources.
Most cases of down syndrome are not inherited. Translocation Down syndrome can be inherited.
The association of Hirschberg with Downs is well-recognized with an incidence of 7.32%
Down Syndrome Is In Your Brain.