What is the chromosomal abnormality in (a) Down’s syndrome (b) Klinefelter syndrome.(ACF 2018)
(a) Down syndrome Down syndrome is a chromosomal disorder caused by the presence of an extra copy of chromosome 21. This results in a total of 47 chromosomes instead of the usual 46. Down syndrome is the most common chromosomal disorder, affecting about 1 in 700 births. (b) Klinefelter syndrome Klinefelter syndrome is a chromosomal […]