Assertion: Down syndrome, Klinfelter syndrome and Turner syndrome are chromosomal disorders. Reason: In Klinfelter syndrome females are sterile.

Question

Assertion: Down syndrome, Klinfelter syndrome and Turner syndrome are chromosomal disorders. Reason: In Klinfelter syndrome females are sterile. (A) If both assertion and reason are true and reason is the correct explanation of assertion (B) If both assertion and reason are true but reason is not the correct explanation of assertion (C) If assertion is true but reason is false (D) If both assertion and reason are false

Tardigrade Admin · Accepted Answer

Klinefelter’s syndrome is a genetic condition that only affects males. The condition is present from birth and is due to an extra X chromosome. Normal males have 45 + XY chromosomes but males with Klinefelter’s syndrome have 45 + XXY chromosome. This condition arises due to non-disjunction at the time of gamete formation leading to formation of abnormal gamete. When either a normal egg fuses with abnormal sperms (XY) or an abnormal egg (XX) fuses with a normal sperm it results in an abnormal zygote, which develops into a boy with the syndrome.

Q. Assertion : Down syndrome, Klinfelter syndrome and Turner syndrome are chromosomal disorders. Reason : In Klinfelter syndrome females are sterile.

If both assertion and reason are true and reason is the correct explanation of assertion

If both assertion and reason are true but reason is not the correct explanation of assertion

If assertion is true but reason is false

If both assertion and reason are false

Q. Assertion : Down syndrome, Klinfelter syndrome and Turner syndrome are chromosomal disorders.
Reason : In Klinfelter syndrome females are sterile.