The theory of evolution of species by natural selection was given by

$A$ cross was carried out between a pure-bred tall pea plant and a pure-bred dwarf pea plant,and $F_{1}$ progeny was obtained. Later,the $F_{1}$ progeny was selfed to obtain $F_{2}$ progeny. Answer the following questions:
$(a)$ What is the phenotype of the $F_{1}$ progeny and why?
$(b)$ Give the phenotypic ratio of the $F_{2}$ progeny.
$(c)$ Why is the $F_{2}$ progeny different from the $F_{1}$ progeny?

Does the occurrence of diversity of animals on earth suggest their diverse ancestry also? Discuss this point in the light of evolution.

What evidences can suggest that, "Modern human beings have originated in Africa"?

Which of the following is responsible for variation?

Which of the following statements is $NOT$ true regarding the $F_{1}$ generation plants obtained by crossing pure tall and pure dwarf pea plants?