The cause of discontinuous variations is-

$A$ mutation that arises due to a change in a single base pair of $DNA$ is known as .... mutation.

Hugo de Vries worked on which of the following organisms?

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.

In a mutational event,when adenine is replaced by guanine,it is a case of

The unmodified allele which represents the original phenotype is the $.........$ allele and the modified allele is generally the $.........$ allele.