Genetics Vocabulary Quiz

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What does heterosis refer to?

Greater fertility than both parents in crosses between species

What is heritability a measure of?

Differences in traits due to genes

What is the selection differential (S) in quantitative genetics?

The difference between the trait mean after selection and before selection

What does the response to selection (R) depend on?

Selection differential (S) and heritability (h2)

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

Trait values and fitness

What does heritability (h2) represent in quantitative genetics?

The proportion of differences in traits due to genes

What is the ultimate source of variation in a population?

Mutation-selection balance

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

Coefficient of variation

What does the heritability measure?

Genetic variation due to genetic effects

What does frequency dependency selection refer to?

Declining reproductive success with increasing frequency of a morph

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

Polymorphism

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

Life history traits

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

Mutation-selection balance

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

Mutation-selection balance

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

Coefficient of variation (CV)

What does pleiotropy refer to?

Single gene affects multiple characters

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

R = h²S

What does the equation R = Gb represent?

The selection response to a given gradient

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

High heritability and selection but no change in the path taken

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

This equation was not provided in the text

What happens if there is no association in two traits?

Covariances become zero

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

Weight increases when height increases

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

Selection differential (S)

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

Dispersal distance of chicks from parents

Test your knowledge of genetics vocabulary with this quiz. Identify terms like heterosis, heritability, selection differential, and more.

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