Genetics: Analysis and Principles
6th Edition
ISBN: 9781259616020
Author: Robert J. Brooker Professor Dr.
Publisher: McGraw-Hill Education
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Chapter 28, Problem 9EQ
In a strain of mice, the average 6-week body weight is 25 g, and the narrow-sense heritability for this trait is 0.21.
A. What would be the average weight of the offspring if parents with a mean weight of 27 g were chosen?
B. What parental mean weight would you have to choose to obtain offspring with an average weight of 26.5 g?
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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 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 narrow-sense heritability (hN2) for potato weight in a starting population of potato plants is 0.42, and the mean weight is 1.4 pounds. If a breeder crossed plants with average potato weights of 1.9 and 2.1 pounds,respectively, what is the predicted average weight of potatoes fromthe offspring?arrow_forwardTwo loci contribute to eyelash length in angora rabbits (locus A and B). Assuming additive genetic variance and disregarding environmental effects, you determine that the following alleles contribute the following values to the total expression of lash length (in cm) A = 2.3, a=1.5, B=2.4, b=1.7 What would the phenotype of a rabbit with a genotype of AABb be? _________cmarrow_forward
- Please refer to the table below. If only data on the variances for F1, F2 and BC1 populations were available, how will the broad sense heritability estimate change? Show solutions.arrow_forwardWhy are monozygotic twins who are reared apart so useful in the calculation of heritability?arrow_forwardSuppose that in a population of Peacocks the phenotypic variance for tail length is 2.5 and the heritability for this trait is 0.4. From a long-term captive population you also have data from a line of completely inbred individuals. In this line the phenotypic variance among individuals is 0.50. Assume that there is no epistatic variance (VI) for this trait. Calculate the following: What is the total genetic variance for tail length? What is the additive genetic variance? What is the dominance genetic variance? What is the environmental variance? What is the broad-sense heritability (H2)?arrow_forward
- The mean and variance of plant height of two highly inbred strains (P1 and P2) and their progeny (F1 and F2) are shown here. Strain Mean (cm) Variance P1 34.2 4.2 P2 55.3 3.8 F1 44.2 5.6 F2 46.3 10.3 Calculate the broad-sense heritability (H2) of plant height in this species.arrow_forwardCalculate the Variance of the following data set: 10, 15, 13, 12, 14arrow_forwardFrom the pedigree shown here, answer the following questions with regard to individual VII-1. A. Who are the common ancestors of her parents? B. What is the inbreeding coefficient for this individual?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_forwardSuppose you grew genetically identical dandelion seeds in an environmentally controlled environment like a greenhouse.Why would you expect to see a phenotypic variance greater than zero for these genetically identical dandelions grown in a constant environment?arrow_forwardUpon further scrutiny of the pine beetles over generations, you discover that they have far more than 11 shades of green—in fact, they seem to have a continuous distribution of shades of green color. You take this population and breed them in two different locations: first in a terrarium in the lab, and then in a tree. In which of these two locations will you get a higher heritability value when you measure the variance of phenotypes in the next generation? a) Higher heritability value in the lab. b) The heritability value will be the same because the beetles are the same. c)Higher heritability value in the tree. d)The answer cannot be determined from the information given.arrow_forward
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