Genetics: Analysis and Principles
6th Edition
ISBN: 9781259616020
Author: Robert J. Brooker Professor Dr.
Publisher: McGraw-Hill Education
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Chapter 28.5, Problem 3COMQ
One way to estimate narrow-sense heritability for a given trait is to compare __________ for _________.
a. variances, related pairs of individuals
b.
c. variances, unrelated pairs of individuals
d. correlation coefficients, unrelated pairs of individuals
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One way to estimate narrow-sense heritability for a given trait isto compare __________ for _________.a. variances, related pairs of individualsb. correlation coefficients, related pairs of individualsc. variances, unrelated pairs of individualsd. correlation coefficients, unrelated pairs of individuals
If the environmental variance (VE) increases and all other variance components remainthe same, what will the effect be?a. Broad-sense heritability will decrease.b. Broad-sense heritability will increase.c. Narrow-sense heritability will increase.d. Broad-sense heritability will increase, but narrow-sense heritability will decrease.
If the environmental variance increase and the genetic variance components remain the same what will the effect be on heritability?
Select one:
O a. Broad-sense heritability will increase
O b. There will be no change.
O c. Broad-sense heritability will increase, but narrow sense heritability will decrease.
O d. Narrow-sense heritability will increase
O e. Broad-sense heritability will decrease
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Chapter 28 Solutions
Genetics: Analysis and Principles
Ch. 28.1 - 1. Which of the following is an example of a...Ch. 28.1 - 2. Saying that a quantitative trait follows a...Ch. 28.2 - The variance is a. a measure of the variation...Ch. 28.2 - 2. Which of the following statistics is used to...Ch. 28.3 - 1. For many quantitative traits, genotypes and...Ch. 28.4 - A QTL is a __________ where one or more genes...Ch. 28.4 - 2. To map QTLs, strains are crossed that differ...Ch. 28.5 - 1. In a population of squirrels in North Carolina,...Ch. 28.5 - Prob. 2COMQCh. 28.5 - 3. One way to estimate narrow-sense heritability...
Ch. 28.6 - 1. For selective breeding to be successful, the...Ch. 28.6 - Prob. 2COMQCh. 28 - Give several examples of quantitative traits.How...Ch. 28 - 2. At the molecular level, explain why...Ch. 28 - 3. What is a normal distribution? Discuss this...Ch. 28 - 4. Explain the difference between a continuous...Ch. 28 - What is a frequency distribution? Explain how such...Ch. 28 - 6. The variance for weight in a particular herd of...Ch. 28 - Two different varieties of potato plants produce...Ch. 28 - 8. If , would you conclude that a positive...Ch. 28 - Prob. 9CONQCh. 28 - When a correlation coefficient is statistically...Ch. 28 - 11. What is polygenic inheritance? Discuss the...Ch. 28 - What is a quantitative trait locus (QTL)? Does a...Ch. 28 - 13. Let’s suppose that weight in a species of...Ch. 28 - Prob. 14CONQCh. 28 - 15. From an agricultural point of view, discuss...Ch. 28 - Many beautiful varieties of roses have been...Ch. 28 - 17. In your own words, explain the meaning of the...Ch. 28 - 18. What is the difference between broad-sense...Ch. 28 - The heritability for egg weight in a group of...Ch. 28 - In a fairly large population of people living in a...Ch. 28 - When artificial selection is practiced over many...Ch. 28 - 22. Discuss whether a natural population of wolves...Ch. 28 - 23. With regard to heterosis, is each of...Ch. 28 - Here are data for height and weight among 10 male...Ch. 28 - 2. The abdomen length (in millimeters) was...Ch. 28 - 3. You conduct an RFLP analysis of head weight in...Ch. 28 - 5. Let’s suppose that two strains of pigs differ...Ch. 28 - Prob. 6EQCh. 28 - In a wild strain of tomato plants, the phenotypic...Ch. 28 - The average thorax length in aDrosophilapopulation...Ch. 28 - 9. In a strain of mice, the average 6-week body...Ch. 28 - Prob. 10EQCh. 28 - 11. A danger in computing heritability values from...Ch. 28 - For each of the following relationships,...Ch. 28 - An animal breeder had a herd of sheep with a mean...Ch. 28 - The trait of blood pressure in humans has a...Ch. 28 - Discuss why heritability is an important...Ch. 28 - From a biological viewpoint, speculate as to why...Ch. 28 - 3. What is heterosis? Discuss whether it is caused...
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- A characteristic has a narrow-sense heritability of 0.6. a. If the dominance variance (VD) increases and all other variance components remain the same, what will happen to narrow-sense heritability? Will it increase, decrease, or remain the same? Explain. b. What will happen to broad-sense heritability? Explain. c. If the environmental variance (VE) increases and all other variance components remain the same, what will happen to narrow-sense heritability? Explain.arrow_forwardA characteristic has a narrow-sense heritability of 0.6.a. If the dominance variance (VD) increases and all other variancecomponents remain the same, what will happen to narrow-senseheritability? Will it increase, decrease, or remain the same? Explain.b. What will happen to broad-sense heritability? Explain.c. If the environmental variance (VE) increases and all other variancecomponents remain the same, what will happen to narrow-senseheritability? Explain.d. What will happen to broad-sense heritability? Explain.arrow_forwardThe heritability for egg weight in a group of chickens on a farm inMaine is 0.95. Are the following statements regarding this heritabilitytrue or false? If a statement is false, explain why.A. The environment in Maine has very little effect on the outcomeof this trait.B. Nearly all of the phenotypic variance for this trait in this groupof chickens is due to genetic variance.C. The trait is polygenic and likely to involve a large number ofgenes.D. Based on the observation of the heritability in the Mainechickens, it is reasonable to conclude that the heritability foregg weight in a group of chickens on a farm in Montana isalso very high.arrow_forward
- Please choose the correct answer. If narrow sense heritability is equal to 1, which of the following is most likely responsible for phenotypic variations? a. additive variance b. dominance variance c. environmental variance d. interactive variancearrow_forwardAre the following statements regarding heritability true or false?A. Heritability applies to a specific population raised in aparticular environment.B. Heritability in the narrow sense takes into account all types ofgenetic variance. C. Heritability is a measure of the amount that genetics contributesto the outcome of a trait.arrow_forwardWhich of the following statistics is used to compare two variables?a. Meanb. Correlation coefficientc. Varianced. Standard deviationarrow_forward
- Heritability of a biological trait is best defined as which of the following? a. The proportion of variation in a trait that is specifically due to genes. b. The proportion of variation in a trait that is due to the environment and genes c. The proportion of variation in a trait that is only due to dominant additive genetic variance. d. The proportion of variation in a trait due to developmental effects.arrow_forwardDescribe in your own words what variance measures. Then explain why the variance of both samples must be used in the calculation of a t-test (In other words, explain why we have to factor in the variance when comparing the means).arrow_forwardWhen calculating heritability in finch beak size using parent/offspring data, we find that 70 percent of the variation in the trait is due to genetics. What might explain the remainder of the variation? Select all that apply. A. nutrition B. color C. precipitation D. stress E. rarity F. temperaturearrow_forward
- The broad-sense heritability of a trait is estimated at 0.6. If the total phenotypic variance is estimated at 30.0, what is the genetic variance? 12 18 36 5 9arrow_forwardExplain the relationship among phenotypic variance, geneticvariance, and environmental variance using an equation.arrow_forwardIn 1-3 sentences each define the follwing terms: complex trait, concordance, environmental variance.arrow_forward
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