Q21 of 43 Page 1

Write by taking a suitable example, the convention followed for naming the restriction enzymes.

• First letter of the name comes from the genus, and the second two letters come from the species of the prokaryotic cell from which they were isolated.


• Example, EcoRI, comes from Escherichia coli, the letter ‘R’ is derived from the name of strain.


• Roman numbers following the names indicate the order in which the enzymes were isolated from that strain of bacteria


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12

How can childless couples be helped by the following assisted reproductive technologies:

→a) GIFT


→b) Cytoplasmic Sperm Injection


 15

Compare the mechanism of evolution as put forth by Charles Darwin and de Vries.

 24

Describe the phosphorus cycle in an ecosystem.

 25

→a) Describe the experiment conducted by F. Griffith in 1928 with Streptococcus pneumoniae and write the conclusions he arrived at.

→b) State the contribution of Avery, MacLeod and McCarty in providing biochemical nature to the results as obtained by Griffith.


OR


→a) Differentiate between convergent and divergent evolution by taking one suitable example of each.


→b) Explain adaptive radiation with the help of suitable examples.