Genetics Vocabulary Quiz
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Questions and Answers

What does heterosis refer to?

  • Greater fertility than both parents in crosses between species (correct)
  • No fertility in crosses between species
  • Smaller fertility than both parents in crosses between species
  • Similar fertility as both parents in crosses between species
  • What is heritability a measure of?

  • Differences in traits due to the environment
  • Differences in traits due to random chance
  • Differences in traits due to diet
  • Differences in traits due to genes (correct)
  • What is the selection differential (S) in quantitative genetics?

  • The difference between the trait mean and the population mean
  • The difference between the trait mean and the response to selection
  • The difference between the genotype and phenotype
  • The difference between the trait mean after selection and before selection (correct)
  • What does the response to selection (R) depend on?

    <p>Selection differential (S) and heritability (h2)</p> Signup and view all the answers

    What is phenotypic selection (S) related to in quantitative genetics?

    <p>Trait values and fitness</p> Signup and view all the answers

    What does heritability (h2) represent in quantitative genetics?

    <p>The proportion of differences in traits due to genes</p> Signup and view all the answers

    What is the ultimate source of variation in a population?

    <p>Mutation-selection balance</p> Signup and view all the answers

    What is the ratio of the standard deviation to the mean called?

    <p>Coefficient of variation</p> Signup and view all the answers

    What does the heritability measure?

    <p>Genetic variation due to genetic effects</p> Signup and view all the answers

    What does frequency dependency selection refer to?

    <p>Declining reproductive success with increasing frequency of a morph</p> Signup and view all the answers

    What is the occurrence of two or more clearly different morphs or forms in a population called?

    <p>Polymorphism</p> Signup and view all the answers

    What is the most closely correlated to fitness and has strong heritability?

    <p>Life history traits</p> Signup and view all the answers

    What is the ultimate source of variation that maintains both alleles in a population?

    <p>Mutation-selection balance</p> Signup and view all the answers

    What refers to the balance between mutation and selection as a source of variation?

    <p>Mutation-selection balance</p> Signup and view all the answers

    What is the ratio of the standard deviation to the mean used for comparing variability of traits?

    <p>Coefficient of variation (CV)</p> Signup and view all the answers

    What does pleiotropy refer to?

    <p>Single gene affects multiple characters</p> Signup and view all the answers

    What is the equation for the response to selection of a single trait?

    <p>R = h²S</p> Signup and view all the answers

    What does the equation R = Gb represent?

    <p>The selection response to a given gradient</p> Signup and view all the answers

    Why might laying date remain fairly constant despite strong selection and climate change?

    <p>High heritability and selection but no change in the path taken</p> Signup and view all the answers

    What is the equation for the response to selection of multiple traits?

    <p>This equation was not provided in the text</p> Signup and view all the answers

    What happens if there is no association in two traits?

    <p>Covariances become zero</p> Signup and view all the answers

    What is the relationship between weight and height if there is a positive covariance?

    <p>Weight increases when height increases</p> Signup and view all the answers

    What is the main factor that influences the relative fitness of an organism according to the given text?

    <p>Selection differential (S)</p> Signup and view all the answers

    What factors influence the similarity of parents and offspring according to the given text?

    <p>Dispersal distance of chicks from parents</p> Signup and view all the answers

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