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Suppose we sample 75 Round Stingrays (Urobatis halleri) from

Suppose we sample 75 Round Stingrays (Urobatis halleri) from Seal Beach, and anoth… Show more Genetics question Suppose we sample 75 Round Stingrays (Urobatis halleri) from Seal Beach, and another 75 Round stingrays just south of Santa Barbara. We extract DNA, perform PCR, score the alleles at 20 microsatellite loci, and calculate an Fst of 0.0012 – which is statistically non-significant. a) What can we say about the genetic divergence between Seal Beach and Santa Barbara? Can we make any assumptions about the number of populations we have sampled? What about gene flow between these two sites (is it high? or is it low?)? b) Chris Lowe (a famous shark biologist) at Cal State Long Beach sent us some samples of Round stingrays from Baja California. We calculate a significant Fst of 0.24 between our Seal Beach and Baja California samples. Does this finding suggest we have sampled two separate populations? What about the level of gene flow between Seal Beach and Baja California (in relative terms, compared to your answer for part a)? Please explain fully! • Show less

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