Question

QUESTION 18 Consider three cases of selection at a dialleic locus with alleles A1 and A2: Relative Fitnesses A2A2 A IAI A142 A2A2 - AIA A142 1242 AZAZ 1 0 .7 0.7 10.9 0.7 Initial Freq. of A1 -0.01; Generations - 500: Population size - Infinite. Al other conditions set to zero. Run the above model in the Alleel program Why does case 1 take so long to start to increase in frequency? Because natural selection can only act on the A1 allele when it is in the homozygote genotype Because the A2 alele is dominant Because when the frequency of the A1 allele is low, the frequency of the A1A1 homozygote is very low None of the above All of the above

Answer 1

18. Answer: Because the Az allele is dominant. A is recessive so recessive allele takes longer time to increase frequency. Cintial frequency was ool which is very low). 19. Answer: (D) A&B In fixation, there will be only one of the alleles remains from existed variants. Natural selection plays a role in it. Also in case 2 A, allele is in incomplete dominance. So it can undergo fixation easily but in case 3 A, is dominant.