Mutation in a virus is caused due to a change in its:

Change in the base sequence within a gene is called:

In pea, a pure tall plant (TT) is crossed with a short plant (tt). What wil be the ratio of pure tall plants to short plants in the F2 generation ?

Which combination of chromosomes in mankind give birth to a male child?

Which among the following is a character of chloroplast which makes them qualified in self-replication?

A trait that increases an organism's chance of survival is called: