According to the evolutionary theory,the formation of a new species is generally due to:

By what name is the branch of biology related to the study of heredity and variation known as?

$(a)$ "Evolution has occurred in stages." Justify the statement.
$(b)$ Differentiate between eye and eyespots. Which animal possesses eyespots?

If the fossil of an organism is found in the deeper layers of the Earth,then we can predict that:

In dogs, the barking trait is dominant over the silent trait and erect ears are dominant over drooping ears. Now, find out
$(i)$ What is the expected phenotypic ratio of the offspring when dogs, heterozygous for both the traits are crossed?
$(ii)$ What are different phenotypes observed?
$(iii)$ What is this type of cross known as?

If a round,green seeded pea plant $(RRyy)$ is crossed with a wrinkled,yellow seeded pea plant $(rrYY)$,the seeds produced in the $F_1$ generation are