The differences observed among individuals are known as...

What are sex chromosomes? Which sex chromosomes are found in male and female human beings? State the chromosome responsible for the development of a male child in human beings?

In pea plants, which trait is dominant between height and dwarfness?

Define evolution. How does it occur? Describe how fossils provide us evidence in support of evolution.

New species may be formed if
$(i)$ $DNA$ undergoes significant changes in germ cells
$(ii)$ chromosome number changes in the gamete
$(iii)$ there is no change in the genetic material
$(iv)$ mating does not take place

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