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

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

Who are the carriers of genes?

$(a)$ Why traits such as intelligence and knowledge cannot be passed on to the next generation?
$(b)$ How can we say that birds are closely related to reptiles and have evolved from them?

What are the basic features of the mechanism of inheritance?

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?