Q5 of 26 Page 1

Name the first discovered restriction endonuclease and state its specific role.

The first discovered restriction endonuclease was Hind II. It cuts DNA molecule at particular point by recognising a specific sequence of six base pairs.


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3

Give an example of an organism that exhibits XO-type of sex determination. What is this sex determination designated as?

 4

How does Gambusia fish help in controlling the spread of Malaria?

 6

(a) State the primary requirement to ensure cross breeding experiments in plants.

(b) Name the techniques which help to achieve this requirement.


 7

What is a cistron? Why is the structural gene in a transcription unit of eukaryotes called monocistronic and that in prokaryotes/bacteria called polycistronic ? Give reasons.