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

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

The first recorded instance of a point 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.

Point mutation is a change which involves

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.