Q24 of 30 Page 1

Identify (A) and (B) illustrations in the following:

(i)


(ii)


(b) write the term given to (A) and (C) and why?


(c) Expand PCR. Mention its importance in biotechnology.


. i) ‘A’ --- ‘ AATTC’

ii) ‘B’--- ‘ ORI site’ i.e. origin of replication


b) A --- Coding Strand C --- Template Strand


c) PCR is Polymerase Chain Reaction.


It can be used for amplification and in various medical and forensic purposes.


It can be used to detect diseases in early stages or to produce various number of copies of a particular strand/gene.


It can be used in analysis and identification of small DNA sequence and ancient DNA and is also used in DNA fingerprinting.


More from this chapter

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22

(a) Sickle celled anaemia in humans is a result of point mutation. Explain.

(b) Write the genotypes of both the parents who have produced a sickle celled anaemic offspring.


 23

What is inbreeding depression and how is it caused in organisms? Write any two advantages of inbreeding.

 25


The diagram above is that of a typical biogas plant. Explain the sequence of events occurring in a biogas plant. Identify a, b and c.


 26

How can crop varieties be made disease resistant to overcome food crisis in India? Explain. Name one disease resistant variety in India of:

(a) Wheat to leave and stripe rust


(b) Brassica to white rust


OR


Write the source and the effect on the human body of the following drugs:


(i) Morphine


(ii) Cocaine


(iii) Marijuana