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Exam 9: Evolution at Multiple Loci: Quantitative Genetics

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Question 1

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The fraction known as the broad-sense heritability (where VG = genetic variation,VP = phenotypic variation,and VE = environmental variation) is expressed by ________.

A) VG/VP
B) VG/VG + VE
C) VG/VP + VE
D) VG/VE
E) A and B are both accurate.

F) B) and E)
G) D) and E)

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Question 2

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In populations where individuals with intermediate values of a trait have the highest fitness,the average value of the trait does not change over time,but the variation tends to be reduced.This set of circumstances is known as ________.[two words]

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Question 3

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________ refers to the fraction of the total variation in a trait that is due to variation in genes.

To learn the location of and determine the role that QTLs have on phenotypes,researchers look for associations between a marker locus genotype and phenotype.Examples of research focusing on such methods have been conducted on ________.

It becomes possible to predict evolutionary changes in a population after we have measured two attributes affecting the population in question.What two measures allow us to make such predictions?

Determining the slope of the best-fit line for a data set of midparent versus midoffspring values by utilizing least-squares linear regression generates an estimate of heritability known as the ________.

Traits that are conditioned by one locus are most appropriately termed ________.

Continuously variable traits typically have a(n)________,[two words] otherwise known as a "bell-curve."

Variation among individuals that is due to factors other than genetic factors is called ________.

The total variation in a trait is known as the ________.

Some have proposed that where human IQ scores are concerned,heritability can tell us something about the causes of differences between population means such as ethnic groups.Explain why this perspective is erroneous.

Data on survival of juvenile black-bellied seedcrackers as a function of beak size is shown in the accompanying figure.Given the relative survival rates of juvenile birds in terms of both the lower mandible width and length,this is a clear example of ________.

When Bradshaw and colleagues investigated the quantitative trait loci (QTL) of two species of Mimulus (Mimulus cardinalis and Mimulus lewisii) ,they used marker loci as a way to map the QTLs.Their results are shown in the accompanying figure.According to these results,________.

In populations where individuals with extreme values of a trait have the highest fitness,the average value of the trait may not change,but the amount of variance in the trait does increase over time.This set of circumstances is known as ________.[two words]

The abbreviation QTL stands for ________,[three words] which are those genes that influence nonqualitative traits.

In cases where selection consistently favors a higher (or lower) value of a trait or phenotype,the result over time is a change in the average value of a trait in the population.This mode of selection is known as ________.

________ selection and ________ selection tend to reduce the amount of variation in a population,whereas ________ selection tends to increase the amount of variation in a population.

Variation among individuals that is due to variation in factors other than environmental influences is called ________.

Multiple trait analysis (beak width and beak depth) on the medium ground finch,in response to the drought of 1976-77,has generated the three-dimensional graph,shown in the accompanying figure.If the blue triangles represent fitness levels for the quantified parameters,then the birds showing the greatest fitness should have ________.

Compare and contrast qualitative traits/genetics with quantitative traits/genetics.