Case Study and Passage Based Questions for Class 12 Biology Chapter 5 Principles of Inheritance and Variation

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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

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