The cause of discontinuous variations is-

$A$ mutation caused by the insertion or deletion of a nucleotide is called ........

What arises due to errors in $DNA$ replication?

$...$ is a phenomenon by which genetic variation is achieved through changes in the base sequences within genes,which creates a new character or trait absent in the parental generation.

Sickle cell anemia is an example of which type of mutation?

What is point mutation? Give one example.