Essential Genetics: A Genomics Perspective, Fourth Edition: Practice Quizzes

Bears

Title Text: Essential Genetics: A Genomics Perspective, Fourth Edition, Daniel L. Hartl and Elizabeth W. Jones

Please read each question and select your answer from the choices provided. You must complete all of the questions in order to view your results. At the end of each exam, you have the option to e-mail your results to your instructor.

1: The ratio of the genotype variance to total phenotypic variance is called
	A: Inbreeding depression
	B: The selection limit
	C: Narrow-sense heritability
	D: Broad-sense heritability
	E: Variance

2: A measure of the spread of the distribution is
	A: The correlation coefficient
	B: The variance
	C: The standard deviation
	D: The median
	E: The mean

3: In a cross between two inbred lines of Pisum sativum, the F1 progeny has the variance of 0.7 for the size of peas. The F2 generation has the variance of 2. What is the genotypic variance?
	A: 1.3
	B: 0.7
	C: 2.7
	D: 2.86
	E: 1.4

4: When genetic and environmental effects contribute independently to phenotype, the total variance equals
	A: The sum of the genotypic and environmental variance
	B: The product of the genotypic and environmental variance
	C: The ratio of the genotypic and environmental variance
	D: The environmental variance minus the genotypic variance
	E: The genotypic variance minus the environmental variance

5: Superiority of a hybrid over either inbred parent with respect to one or more traits is called
	A: The inbreeding coefficient
	B: Heterosis
	C: The selection limit
	D: The liability
	E: Genotype-environmental association

6: When different genotypes in a population are not distributed at random among all the possible environments, there is
	A: Genotype-environmental interaction
	B: Hardy-Weinberg equilibrium
	C: Genotype-environment association (G-E association)
	D: Correlated response
	E: Inbreeding depression

7: If the variance of a normal distribution is 0.36, then the standard deviation equals
	E: 0.6

8: Given a normal distribution what percent of the population have a phenotype within three standard deviations of the mean
	A: 99.70%
	B: 95%
	C: 68%
	D: 50.40%
	E: 25%

9: The difference in the mean length of corolla tube between two lines of tobacco is 6 mm and the genotypic variance is estimated as 1.12 square mm. What is the minimum number of genes affecting this trait?
	A: 4

10: If the correlation coefficient between offspring and average of the parents is 0.02, what is the narrow sense heritability?
	A: 0.02
	B: 0.04
	C: 0.08
	D: 0.16
	E: 0.32

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