Answered: You observe some bark beetles with…

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter19: Population Genetics And Human Evolution

Section: Chapter Questions

Problem 9QP: Using the HardyWeinberg Law in Human Genetics Suppose you are monitoring the allelic and genotypic...

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You observe some bark beetles with different feeding behaviors. You find that the behavioral phenotypes you observed are closely associated with the following genotypes.

genotype	phenotype	number observed
BB	feeds under bark	60
Bb	feeds on top of bark	24
bb	feeds on leaves	16

a) What are the allele frequencies and the expected number (out of 100 beetles) of genotypes?

b) Calculate the Chi-Squared value (c²). Then look up the p-value only using this Chi-squared calculator: https://www.mathsisfun.com/data//chi-square-calculator.html

Clear all the values in the box at upper right, enter the Chi Square value that you obtain FROM YOUR CALCULATIONS in the Chi-Square box, and enter 1 for the degrees of freedom. Is the population in H-W equilibrium?

If you answered “No” to b): Provide at least three biologically valid reasons why the observed beetle population may not be in equilibrium.

If you answered “Yes” to b): Why do you think this might be the case?

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Where did you get the table chi square value of 3.84 from?

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