Q13 of 30 Page 1

Explain brood parasitism with the help of an example.

Brood parasitism is a type of parasitism in which the parasitic bird lays its eggs in the nest of its host and lets the host incubate them. During the course of evolution, the eggs of the parasitic bird have evolved to resemble the host’s egg in size and colour to reduce the chances of the host bird detecting the foreign eggs and ejecting them from the nest. A very common example of brood parasitism is seen in the case of Asian Koel which lays its eggs in the nest of the crow.


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(a) Where do the signals for parturition originate from in humans?

(b) Why is it important to feed the new born babies on colostrum?


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(a) A recombinant vector with a gene of interest inserted within the gene of α-galactosidase enzyme, is introduced into a bacterium. Explain the method that would help in selection of recombinant colonies from non-recombinant ones.

(b) Why is this method of selection referred to as “insertional inactivation”?


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Give reasons for the following:

(a) The human testes are located outside the abdominal cavity.


(b) Some organisms like honey-bees are called parthenogenetic animals.


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OR


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