An individual can pass on to its progeny the experiences of its lifetime.

The two versions of a trait (character) which are brought in by the male and female gametes are situated on

Variation is useful for the survival of species over a long time. However,the variants have unequal chances of survival. Explain this statement.

$(a)$ What function is performed by human arms,forelimbs of a dog,and forelimbs of whales?
$(b)$ Which type of organs are these?
$(c)$ Why are they called so?

Mendel observed a contrasting trait in relation to the position of flowers. Mention that trait.

In humans, there are two pairs of sex chromosomes.