Assertion: Senescence is the time when age associated defects are manifested.
Reason: Certain genes may be undergoing sequential switching on and off during one's life.
(a) If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
(c) If the Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.
(e) If the Assertion is incorrect but the Reason is correct.
(a) If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
Explanation:
According to programmed senescence theory of ageing, ageing is a result of switching on and off of certain genes. B and T- lymphocytes undergo programmed cell death called apoptosis.