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 continuity of germ plasm.

Step-by-step solution

If humans share ancestry with other primates, then we should expect to see remnants of that common ancestry in our genes. For example, tails; this characteristic is still exhibited occssionally in atavism. According to current evolutionary theory, the ancestors of humans lost their tails about 25 million years ago, when apes (tail-less primates) diverged from monkeys (tailed primates). Theory of the continuity of the germplasm was given by Weismann. The German biologist Weismann recognized that animals are made up