Q. Assertion Human ancestors never used their tails and so the tail expressing gene has disappeared in them.
Reason Lamarck's theory of evolution is popularly called theory of continuity of germ plasm.

 2013  245 AIIMSAIIMS 2008 Report Error

Solution:

If humans share ancestry with other primates such as prosimian, monkeys etc, then remnants of that common ancestry should be present in our genes. The theory of continuity of germplasm was proposed by Weismann. So, both assertion and reason are false.