The plant on which Hugo de Vries worked to propose his theory of mutation is .....

Assertion $(A)$: Mutation results in changes in genotype and phenotype of an organism.
Reason $(R)$: Mutation leads to alteration of $\text{DNA}$ sequences,i.e.,variations in $\text{DNA}$.
Choose the correct answer from the options given below.

The gene which increases the frequency of mutation in other gene is referred to as

$...$ 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.

Which of the following types of mutation involves the reverse order of genes in a chromosome?

If the $DNA$ codons are $ATG\ ATG\ ATG$ and a cytosine base is inserted at the beginning,which of the following will result?