$(i)$ $(a)$ Write the full form of $DNA$.
$(b)$ State the role of $DNA$ in the cell nucleus.
$(c)$ What will be the after-effect if the information of the $DNA$ is changed?
$(ii)$ Explain the importance of $DNA$ copying in reproduction.

(N/A) $(i)$ $(a)$ The full form of $DNA$ is Deoxyribonucleic Acid.
$(b)$ $DNA$ acts as the information source for making proteins in the cell. Different proteins lead to altered body designs.
$(c)$ If the information in the $DNA$ is changed,the proteins synthesized will be different,which may lead to the production of different body designs or non-functional proteins.
$(ii)$ $DNA$ copying is essential in reproduction because it ensures that the offspring receive a blueprint of the parent's body design. It maintains the continuity of species characteristics. If $DNA$ copying does not occur,the new cells or organisms will not have the necessary instructions to function or maintain the specific body design of the species.