Assertion : Senescence is the time when age associated defects are manifested. Reason : Certain genes may be…
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.
both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
both Assertion and Reason are true but the Reason is not the correct explanation of the assertion
Assertion is true but Reason is false.
both Assertion and Reason are false.
Solution
Process of ageing is called senescence. Ageing, is cumulative changes in an organism, organ, tissue, or cell leading to a decrease in functional capacity. In humans, aging is associated with degenerative changes in the skin, bones, heart, blood vessels, lungs, nerves, and other organs and tissues. It is genetically controlled programme regulated by regulatory genes. This view is suggested by the great range of lifespans among different animal speciesfrom a few days in the fruit fly to more than 100 years in some tortoises. Scientists have recently learned how to double the lifespans of such laboratory organisms as roundworms and fruit flies through genetic manipulation, and mutant genes in mice have been observed to have a comparable effect in postponing ageing.