Human teeth and elephant’s tusk are :

Independent inheritance of two separate traits, shape and colour of seeds in Mendel’s cross on pea plants resulted in a observable ratio of:

Which of these is not a vestigial organ in human beings?

Evolution of wild cabbage is an example of:

The modern day human species has evolved from its earliest ancestors who lived in:

Two pink coloured flowers on crossing resulted in 1 red, 2 pink and 1 white flower progeny. The nature of the cross will be:

Which of the following statement is incorrect?

If a round, green seeded pea plant (RR yy) is crossed with wrinkled, yellow seeded pea plant (rr YY), the seeds produced in $F_{1}F\_1$ generation are:

A zygote which has an X – chromosome inherited from the father will develop into a:

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 basket of vegetables contains carrot, potato, radish and tomato. Which of them represent the correct homologous structures?

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

A trait in an organism is influenced by:

Select the group which shares maximum number of common characters.

In peas, a pure tall plant (TT) is crossed with a short plant (tt). The ratio of pure tall plants to short plants in $F_{2}F\_2$ is: