171. In hardy-weinberg equation, the frequency of all homozygous individuals is represented by. (1) p (3) 2pq (2) q (4) p+q 172. Excess use of herbicides, Pesticides has only resulted in selection of resistant varieties in a much lesser time scale it was an example of evolution by: (1) Mass extinction (2) Anthropogenic action (3) Continental drift (4) Both (1) and (3) 173. In replica-plate experiment some bacteria able to grow in penicillin contaning medium due to :- (1) Natural selection (2) Reproductive isolation (3) Genetic drift (4) Crossing over 174. What isn't true about evolution? (1) It is a stochastic process (2) It depends on chance events in nature (3) It depends on chance mutations in organisms (4) It is a directed process in the sense of determinism 175. aliated phenotypic characteristic eliminated phenotypic characterise This graph indicates which type of natural selection in a population (1) Stabilizing selection (2) Disruptive selection (3) Directional selection (4) None of them