plz explain and ans

plz explain and ans y condition is en in (1) Tumer's syndrome Klinefeitees syndrome (3) Down's syndrome (4) Both (2) & (3)

Dear Student, Allosomic trisomy is seen Klinefelter's syndrome. Klinefelter's syndrome is due to trisomy of X-chromosome. It is formed by the union of an abnormal XX egg and a normal Y sperm or normal X egg and abnormal XY sperm. The individual has 47 chromosomes. So option (2) is correct. Thank You!