Short Answer Typea) 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?
State the ‘Central dogma’ as proposed by Francis Crick. Are there any exceptions to it? Support your answer with a reason and an example.
Explain how the biochemical characterisation (nature) of ‘Transoforming Principle’ was determined. which was not defined from Griffith’s experiments.
Following are the responses of different animals to various abiotic factors. Describe each one with the help of an example.
(i) Regulate
(ii) Conform
(iii) Migrate
(iv) Suspend
If 8 individuals in a population of 80 butterflies die in a week, calculate the death rate of population of butteflies during that period.
Explain the role of the ‘first trophic level’ in an ecosystem.
First trophic level is formed by producers. This is the basic unit. These organisms can live without feeding on any another level.
The only thing that these organisms need to survive is sunlight and water which they can turn into energy themselves. All other trophic levels depend on this level of energy.
Explain the events up to double fertilisation after the pollen tube enters one of the synergids in an ovule of an angiosperm.
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