BIOL 1202 : Hardy Weinberg Examples
Document Summary
This population is not in hardy-weinberg equilibrium because the allelic frequencies of h and h change from one generation to the next. Problem : in a population of giraffes, the gene that determines neck length has two alleles, n for longer necks and n for shorter necks. Only giraffes with two n alleles will have long necks. In one generation, the frequency of n is p=0. 4 and the frequency of n is q=0. 6. This generation experiences a large forest fire that kills all low-growing plants, leaving tall trees with high branches as the only food source. In the next generation, 49% of giraffes have long necks. The frequency of giraffes with two n alleles is determined by p^2. In the first generation, this is (0. 4)^2 = . 16 or 16%. Since 49% of giraffes in the second generation have two n alleles, selection has increased the frequency of. Working backwards we find that 49% = 0. 49 = p^2, so p =
