Who reported that Down's syndrome is due to extra 21st chromosome?

Q. Down syndrome is due to

Q. Down syndrome and Turner syndrome are due to respectively

Q. Down syndrome is due to non-disjunction of

Q.

Mark the odd one w.r.t to syndrome which occur due to failure of segregation of homologous pair of chromosomes during cell division cycle

A) klinefelter syndrome

B) down syndrome

C) turner syndrome

D) thalassemia

Q. Q15. Consider the following statements about Down Syndrome:
1. Down syndrome (DS or DNS), also known as trisomy 21, is a genetic disorder.
2. There is no cure for Down syndrome.
Which of the above statement/s is/are correct?