CBSE Class 9 Answered
SIR/MADAM
Asked by bhanu24 | 24 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 | 25 Dec, 2009, 08:05: AM
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