How is variation maintainedif natural selection is operating?spatial (conditions differ from place to place) and temporal variation (conditions vary from time to time in seasons or years) creates conditions where different forms are favored so that many types persist;sexual reproduction and crossing over also continuously shuffle the genetic deck and create new genetic combinations
You are hired by Insects-R-US to study cockroaches. They have a good insecticide, but a few cockroaches can eat it and live. These roaches carry the T allele. Your job is to estimate allele frequencies after a few generations of exposure to insecticide. You sample roaches and find these genotype frequencies:f (TT) = 0.05: f (Tt) = 0.50; f (tt) = 0.45•What is the frequency of the T allele in the population:• A. 0.10• B. 0.20•C. 0.30• D. 0.40• E. 0.50f(T) = 2 x N x 0.05 + 1 x N x 0.50 / 2N= 0.60/2 = 0.30
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