When mutation is confined to only one substitution,it is called

Mutation introduces new genes into a species and brings about the changes in

Sometimes cattle or even human beings give birth to their young ones that have extremely different sets of organs,such as limbs or the position of eyes. Comment.

Which of the following causes a change in the genetic material?

Which of the following is a mutagen (not a polyploidy-inducing agent)?

Which one of the following mutations partially or fully reverses the harmful effects of a previous mutation?