In some viruses, DNA is synthesised by using RNA as template. Such a DNA is called:
A. A-DNA

B. B-DNA

C. cDNA

D. rDNA

(a) Write the scientific name of the organism Thomas Hunt Morgan and his colleagues worked with for their experiments. Explain the correlation between linkage and recombination with respect to genes as studied by them.

(b) How did Sturtevant explain gene mapping while working with Morgan?

OR

(a) State the ‘Central dogma’ as proposed by Francis Crick. Are there any exceptions to it? Support your answer with a reason and an example.

(b) Explain how the biochemical characterisation (nature) of ‘Transforming Principle’ was determined, which was not defined from Griffith’s experiments.

With the help of an algebraic equation, how did Hardy-Weinberg explain that in a given population the frequency of occurrence of alleles of a gene is supposed to remain the same through generations?

OR

Although a prokaryotic cell has no defined nucleus, yet DNA is not scattered throughout the cell. Explain.

Why is DNA molecule considered as a better hereditary material than RNA molecule?

Why do DNA fragments move towards the anode during gel electrophoresis?

Define an operon. giving an example, explain an Inducible operon.