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 spider’s response to temperature, with 2 alleles THot and TCold. 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 THot/THot homozygotes die, while all TCold/THot and TCold/TCold individuals live.

Every spring, the surviving spiders randomly mate, restoring Hardy-Weinberg genotype proportions.

Every summer, all TCold/TCold homozygotes die, while all THot/TCold and THot/THot 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?

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 spider's response to temperature, with 2 alleles, Trot and 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 0.250 Every winter, all Tion homozygotes die, while all TColaITI and Told Tri ot old individuals live. Every spring, the surviving spiders randomly mate, restoring Hardy-Weinberg genotype proportions. Every summer, all TColul TCola homozygotes die, while a old and 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. Don't forget to renormalize (so your frequencies are equal to 1 after selection). Plot fTroy against the number of generations.

Explanation / Answer

A) Answer.

As mention in the question itself every winter THot/THot homozygote die whereas TCold/THot and TCold/TCold are alive Similarly in summer all TCold/TCold homozygote die whereas THot/TCold and THot/THot.so while observing their season phase we can say that their proportion are same in both summer and winter

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