Question

You have journeyed to the center of the earth, and discovered the lost population of Tyrannosaurus rex. Naturally, the first thing you do is study evolution in their population. 10) You identify the Ferocity locus, and notice that the Tyrannosaurs differ in fitness depending on their genotypes (FF, Ff and ff) and the associated phenotypes, and the associated trait is heritable. a) What evolutionary mechanism is relevant to this scenario? (2 points) b) FF and Ff individuals have the same fitness, but ff individuals only have the fitness of the other two genotypes (due to insufficient ferocity). Write the relative fitnesses of the 3 genotypes. What is the value of s, the selection coefficient? (4 points) c) If the frequency of fin the Tyrannosaur population is 0.4. and the distribution of genotypes is as would be expected from Hardy-Weinberg, what is the mean fitness of the population? Assume the genotype fitnesses from part b. (5 points) d) After one generation given the fitness differences between genotypes from part b. what would the new frequency of f be? (6 points) e) If the fitness differences between the genotypes described above remains the same for the next 100 generations, what do you expect to happen to the fallele? You may want to draw a figure. (5 points)

Answer 1

- 10.) @ Evolutionary me! colutioncory mechanism relevent to provided scenario is natural selection under going ire population of maturally selected to survive under such condition and also mutation in some geue must occur to . evolve and adopt to such climatic condition Or. Fitness - ffa's, Ff= ff=0.5. (relative fitness Selection coefficint - SFF =(1-1)-0, Sef=(1-1)-0 S4=(-0.5) & f = 0.4 than as population in Hof f=(-0.4) = 0.6 Thus, p² (FF) =) (0-6) ² 0.36 ,. 9² 10 43 20 16 (ff) 269 (F%) - 2 X 0,6X09 5.0:48 Mean Sitness To - (0.36 XD) 4 (0:40X9.) 4 (8-16 X0.55) ey, W (0:32) (abbzoxo). 1) New frequency of b (ment generation, selection pressure applied (0.16 X 0.5)+ ((6.48XV/?? 10.89 +(932/0,32) = 0.35 (abbautó. en If the filness remain same for 100 generation at will result in fixation of fallele in bobulation allele f will decrease from 0.4 to rem fow value infler 100 generation. 0.4 70 35 and so on. GOGA