$A$ zygote which has an $X-$ chromosome inherited from the father will develop into a

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

An angiosperm plant having red coloured flowers when crossed with another having the same colour produced $40$ progenies,out of which $30$ plants were with red coloured flowers and $10$ plants were with white coloured flowers. Find out:
$(a)$ What is the possible genotype of parent plants?
$(b)$ Which trait is dominant and which is recessive?
$(c)$ What is this cross called and what is its phenotypic ratio?

Select the group which shares the maximum number of common characters.

Select the incorrect statement.

"Experiences of an individual during its lifetime cannot be passed on to its progeny and cannot direct evolution". Justify this statement giving an example.