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.
How is the detritus food chain connected with the grazing food chain in a natural ecosystem?
GFC is Grazing Food Chain: It is depicted as below :
Producers → Primary consumers → Secondary consumers
DFC is Detritus Food Chain : It begins with the dead organic matter. It is made up of decomposers which are heterotrophic organisms like fungi, bacteria etc.
GFC is the major conduct for energy flow. DFC may be connected with GFC at some levels: Some of the organisms of DFC are prey to the GFC animals.
These natural interconnection of food chains forms food web.
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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