Asked by bhanu24 | 24th Dec, 2009, 01:03: PM

Expert Answer:

This is because they have some control mechanism which does not allow the disease to develop in them.

For eg. Scientists have discovered a gene called SPRN6 which enables a mosquito to defend itself. When mosquitoes are infected with the malaria parasite this gene is switched on, thereby preventing the mosquitoes from falling sick.

Answered by  | 25th Dec, 2009, 08:05: AM

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