Case Study/Passage Based Questions:
Question 1:
Study the flowchart given below and answer the questions that follow.
(i) What is a mutagen? Name a physical factor that can be mutagen.
(ii) What is point mutation? Give one example.
(iii) Mention two causes of frame-shift mutation.
Answer
Ans.(i) All the physical and chemical factors that induce mutation are called mutagens. UV radiation and X-rays are physical mutagens.
(ii) Mutation arising due to change in a single base pair of DNA is called point mutation.
(iii) Insertion and deletion of three bases or multiples of three bases cause frame-shift mutation because the reading frame remains unaltered from that point onwards
