ESSENTIALS OF GENETICS-W/MOD.ACCESS
9th Edition
ISBN: 9780134452876
Author: KLUG
Publisher: PEARSON
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Chapter 21, Problem 14PDQ
A hypothetical study investigated the vitamin A content and the cholesterol content of eggs from a large population of chickens. The variances (V) were calculated, as shown below:
| Variance | Vitamin A | Cholesterol |
| VP | 123.5 | 862.0 |
| VE | 96.2 | 484.6 |
| VA | 12.0 | 192.1 |
| VD | 15.3 | 185.3 |
(a) Calculate the narrow-sense heritability (h2) for both traits.
(b) Which trait, if either, is likely to respond to selection?
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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.
A hypothetical study investigated the vitamin A content and thecholesterol content of eggs from a large population of chickens.The variances (V) were calculated, as shown at the top of the nextcolumn:
Variance Vitamin A CholesterolVP 123.5 862.0VE 96.2 484.6VA 12.0 192.1VD 15.3 185.3
Calculate the narrow-sense heritability (h2) for bothtraits.
Two inbred lines of rice are intercrossed. In the F1, the variance in panicle weight is measured to be 12 g2. The F1 is selfed, and in the F2, the variance in panicle weight is 38 g2. Estimate the broad sense heritability of panicle weight in the F2 population of this experiment.
If there is no genetic variation within a population for a given trait, what is the broad sense heritability value for the trait in the population?
Chapter 21 Solutions
ESSENTIALS OF GENETICS-W/MOD.ACCESS
Ch. 21 -
CASE STUDY | A genetic flip of the coin
On July...Ch. 21 - CASE STUDY|A genetic flip of the coin On July 11,...Ch. 21 -
CASE STUDY|A genetic flip of the coin
On July...Ch. 21 - HOW DO WE KNOW?
1. In this chapter, we focused on...Ch. 21 - Review the Chapter Concepts list on page 422....Ch. 21 -
3. Define the following: (a) polygenic, (b)...Ch. 21 - A dark-red strain and a white strain of wheat are...Ch. 21 - Height in humans depends on the additive action of...Ch. 21 -
6. An inbred strain of plants has a mean height...Ch. 21 - Prob. 7PDQ
Ch. 21 - In the following table, average differences of...Ch. 21 - What kind of heritability estimates (broad sense...Ch. 21 - List as many human traits as you can that are...Ch. 21 - Corn plants from a test plot are measured, and the...Ch. 21 -
12. The following variances were calculated for...Ch. 21 - The mean and variance of plant height of two...Ch. 21 - A hypothetical study investigated the vitamin A...Ch. 21 - In a herd of dairy cows the narrow-sense...Ch. 21 - In an assessment of learning in Drosophila, flies...Ch. 21 - Suppose you want to develop a population of...Ch. 21 -
18. In a population of tomato plants, mean fruit...Ch. 21 - In a population of 100 inbred, genotypically...Ch. 21 - In a cross between a strain of large guinea pigs...Ch. 21 - While most quantitative traits display continuous...
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- Suppose 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_forwardAssume that these two loci are the only sources of additive genetic variance for body mass. The total phenotypic variance for body mass in the population is 10 kg2. What is the narrow sense heritability (h2) of body mass in this population?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 additive genetic variance? What is the dominance genetic variance? What is the environmental variance? What is the broad-sense heritability (H2)?arrow_forward
- One variety of pigs reach maturity at 81 days with a variance of 6.4 days2 while a second variety takes 93 days to reach maturity with a variance of 6.6 days. An F2 population derived from these populations takes 87 days to reach maturity and has a variance of 8.5 days. What is the broad-sense heritability for this trait?arrow_forwardPlease 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_forwardPlease 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_forward
- In a horse population, three different traits showing continuous distribution were measures, and their variances are shown in the table below: Calculate the broad sense and narrow sense heritabilities for each trait.arrow_forwardPopulation A consists of 100 hens that are fully isogenicand that are reared in a uniform environment. Theaverage weight of the eggs they lay is 52 g, and the variance is 3.5 g2. Population B consists of 100 geneticallyvariable hens that produce eggs with a mean weight of52 g and a variance of 21.0 g2. Population B is raised in anenvironment that is equivalent to that of Population A.What is the environmental variance (Ve) for egg weight?What is the genetic variance in Population B? What is thebroad-sense heritability in Population B?arrow_forwardIn a horse population, three different traits showing continuous distribution were measured,and their variances are shown in the table below:(see image) 1. Calculate the broad sense and narrow sense heritabilities for each trait.2. In the population of animals studied, which trait would respond best to selection for breeding purposes? Explain your answer.arrow_forward
- a) Two inbred lines of rice are intercrossed. In the F1, the variance in panicle weight is measured to be 12 g2. The F1 is selfed, and in the F2, the variance in panicle weight is 38 g2. Estimate the broad sense heritability of panicle weight in the F2 population of this experiment. b) If there is no genetic variation within a population for a given trait, what is the broad sense heritability value forthe trait in the population?arrow_forwardCalculate the Variance of the following data set: 10, 15, 13, 12, 14arrow_forwardIn a horse population, three diferrent traits showing continuous distribution were measures, and their variances are shown in the table below: Calculate the broad sense and narrow sense heretabilities for each trait.arrow_forward
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