Prevalence of pesticide resistant insects
According to Darwin's concept of natural selection, the organisms which are provided with favourable variations would survive because they are the fittest to face their surrounding while the organisms which are unfit for surrounding variations are destroyed. Prevalence of pesticide resistant insects is due to adaptability of these insects for the changes in environment due to use of pesticides.
A DNA satellite is a region that consists of short DNA sequences repeated many times. The variation between individuals in the lengths of their DNA satellites forms the basis of DNA fingerprinting.
DNA satellites are of two types, i.e. microsatellites and minisatellites. Their characteristic that makes them useful for identification is that they are highly polymorphic. The length of each satellite in DNA is inherited.
The length of satellite regions are highly variable between people. These form small peaks during density gradient centrifugation and thus are invaluable for identification purposes.
In the circuit shown, the current in the 1 resistor is :
1.3 A ,from P to Q
0.13 A ,from Q to P
0.13 A ,from P to Q