Answer to Question #181122 in Evolution for dima

Question

A population of garter snakes is being studied in the US, where the garter snakes have a variable level of resistance to neurotoxin produced by one of their prey animals, the newt. Neurotoxin resistance in these snakes is controlled by one gene, with two alleles, R (dominant, resistant) and r (recessive, not resistant). Previously, the scientists had obtained a frequency for the R allele of 0.25. During a survey several years after newts arrived, they surveyed 1000 animals, and 745 had resistance to the neurotoxin of those sampled. You should do a chi-square statistical analysis to compare the number of alleles over time, assuming the population is in Hardy-Weinberg at the time of the survey (you may want to know that the critical value for 2 is 3.841 for 1 degree of freedom at ɑ=0.05). Do you think that there is evidence that evolution is occurring? Support your answer using your statistics referencing the number of alleles. Include calculated allele frequencies and chi-square results for part marks. (5 marks)

Answer 1

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