1.0 Final requencies 0.8 A2: 1 AIA:0 ATA2 0 AZA2 1 04 02 0 2040 Generation 1.0 0
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1.0 Final requencies 0.8 A2: 1 AIA:0 ATA2 0 AZA2 1 04 02 0 2040 Generation 1.0 08 2 06 Final frequencies A:004966 A2 095014 AIA:0 00247 A1A2:0.09438 2A2 0.90315 02 0 2040 Generation 8. (a) The graphs above show the results of simulations of the effect of selection on deleterious alleles. Genetic drift is not a factor in either simulation and the starting frequency and the strength of selection are the same. Based on the shape of the curves, why do the results of the simulations differ? Explain your answer. (25 pts)Explanation / Answer
The reason for the change observed in the simulation model in a finite population are usually attributed to sampling variation due to genetic drift.
But the graphs obtained after simulation above show alleles being eliminated and as stated we cannot consider genetic drift as a factor as well as the strength of selection and the starting frequency is said to be the same. Thereforethis model is a neutral model where the genetic variation simulated has no effect on fitness and therefore the alleles are maintained for no particular purpose.
The first graph shows that there is more mutations that occur to completely eliminate the deleterious alleles and the second graph shows a slight retention of the alleles. The mutations are neutral or nearly neutral and remai in the DNA and proteins and show up as slight observed level of variance. Moreover the simulation is related to recessive alleles as thier elimination in the population becomes progressively slower.
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