You have a population of spiders that have two generations per year, one in the

Question

You have a population of spiders that have two generations per year, one in the spring and one in the fall. There is a locus that controls the spiders response to temperature, with 2 alleles, T and T^Cold. You start out in the Fall, with equal numbers of the alleles, and the population in Hardy-Weinberg genotype proportions (i.e. 0.25/0.5/0.25) Every winter, all T^Hot/I^Hot homozygotes die, while all T^Cold/T^Hot and T^Cold/T^Cold individuals live. Every spring, the surviving spiders randomly mate, restoring Hardy-Weinberg genotype proportions. Every summer, all T^Cold/T^Cold homozygotes die, while all T^Hot/T^Cold and T^Hot/T^Hot individuals live. Every fall, the surviving spiders randomly mate, restoring Hardy-Weinberg genotype proportions. A) Without doing any calculations yet, what must happen to the frequency of the two alleles over time? B) Calculate the first few years of selection, one generation at a time. Dont forget to renormalize (so your frequencies are equal to 1 after selection). Plot f(T^Hot) against the number of generations.

Explanation / Answer

A) The frequency of the alleles in all seasons sum upto 1, since the population is in Hardy-Weinberg equilibrium. The frequency of Thot/Thot will be zero in winter, the frequency of other two alleles (0.5/0.5) will sum upto 1. Similarly, the frequency of Tcold/Tcold will be zero in summer( 0.5/0.5), the frequency of other two alleles will sum upto 1.

B) If the population is in Hardy-Weinberg equilibrium, the prportion of the alleles will remain the same in the next generations, however if selection occurs, it has to be mentioned which allele is selected for calculating proportion of allele in a selected population.

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