In peas, a pure tall (TT) is crossed with a pure short plant(tt). The ratio of pure tall plants to pure short plants in the F2 generation is:

Humans have two different sex chromosomes, X and Y. Based on Mendel’s laws, a male offspring will inherit which combination of chromosomes?

Miller and Urey performed an experiment to prove the origin of life from organic compounds. The gases they took were:

Which of the following is a pair of analogous organs?

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

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

The surprise products formed in the experiment conducted by Miller and Urey were:

From the list given below, select the character which can be acquired but not inherited.

In humans, if gene B gives brown eyes and gene b gives blue eyes, what will be the colour of the eyes of the person having combination (i) Bb (ii) BB:

What is the probability that the male progeny will be a boy?

Which of the following does Darwin’s theory not include?

In pea plants, yellow seeds are dominant to green seeds. If a heterozygous yellow-seeded plant is crossed with a green-seeded plant, what ratio of yellow and green-seeded plants would you expect in the F1 generation?