Essentials of Genetics Plus Mastering Genetics with eText -- Access Card Package (9th Edition) (Klug et al. Genetics Series)
9th Edition
ISBN: 9780134047201
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino
Publisher: PEARSON
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Textbook Question
Chapter 21, Problem 9PDQ
What kind of heritability estimates (broad sense or narrow sense) are obtained from human twin studies?
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What kind of heritability estimates (broad sense or narrow sense) are obtained from human twin studies?
Why are monozygotic twins who are reared apart so useful in the calculation of heritability? What assumption is being made about their respective environment?
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 variance
Chapter 21 Solutions
Essentials of Genetics Plus Mastering Genetics with eText -- Access Card Package (9th Edition) (Klug et al. Genetics Series)
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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- What is the importance of the comparison of traits between adopted and natural children in determining heritability?arrow_forwardIf monozygotic twins show complete concordance for a trait, whether they are reared together or apart, what does this suggest about the heritability of the trait?arrow_forwardA pedigree analysis was performed on the family of a man with schizophrenia. Based on the known concordance statistics, would his MZ twin be at high risk for the disease? Would the twins risk decrease if he were raised in an environment different from that of his schizophrenic brother?arrow_forward
- Why are relatives used in the calculation of heritability?arrow_forwardIn the following table, average differences of height, weight,and fingerprint ridge count between monozygotic twins (rearedtogether and apart), dizygotic twins, and nontwin siblings arecompared: Based on the data in this table, which of these quantitative traitshas the highest heritability values?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_forward
- Why is the narrow sense heritability more useful to plant and animal breeders than broad sere heritability?arrow_forwardIn your own words, explain the meaning of the term heritability.Why is a heritability value valid only for a particular population ofindividuals raised in a particular environment?arrow_forwardWhat does a heritability score tell us about HOW genes and environment interact in an individual to produce a trait?arrow_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_forwardHow are the standard deviation and variance related to each other? How are they different than just measuring the range? Can plot samples of dandelion cover from two different locations have the same mean but different variance? Explain. Can you answer question 3? Thanks.arrow_forwardThe leaf width of a particular plant has an environmental variance of 2.3 cm, an epistatic variance of4.8 cm, a dominance variance of 1.6 cm, and an additive variance of 3.8 cm. Determine, and interpret,the broad sense and narrow sense heritability.arrow_forward
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