Hugo de Vries formulated the "Mutation Theory" based on the experiments he conducted on:

Which one of the following is a physical factor that induces mutation?

$...$ 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.

When different genotypes exhibit the same phenotype due to environmental differences,each is known as a .........

Mutations caused by mutagenic agents are termed as

Which mutation causes a change in an allele?