Genetic Analysis: An Integrated Approach (2nd Edition)
2nd Edition
ISBN: 9780321948908
Author: Mark F. Sanders, John L. Bowman
Publisher: PEARSON
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Textbook Question
Chapter 21, Problem 21P
New Zealand lamb breeders measure the following variance values for their herd.
16.2 
a. Calculate the broad sense heritability
b. How would you characterize the potential response to selection (R) for each trait?
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1) The following variances were calculated for two traits in a herd of hogs.
Trait
Vp
VG
VA
Back fat
30.6
12.2
8.44
Body length
52.4
26.4
11.70
Calculate the broad sense heritability (H?) and narrow sense heritability's (h2) for each train in this herd.
Which of the two traits will respond best to the selection by a breeder? Why?
Phenotypic variation in the tail length of mice has the following components: Additive genetic variance (VA) Dominance genetic variance (VD) Gene interaction variance (VI) Environmental variance (VE) Genetic–environmental interaction variance (VGE) a. What is the narrow-sense heritability of tail length? b. What is the broad-sense heritability of tail length?
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.
Chapter 21 Solutions
Genetic Analysis: An Integrated Approach (2nd Edition)
Ch. 21 - Which of the following traits would you expect to...Ch. 21 - 19.2 For the traits listed in the previous...Ch. 21 - Compare and contrast broad sense heritability and...Ch. 21 - 19.4 In a cross of two pure-breeding lines of...Ch. 21 - 19.5 Describe the difference between continuous...Ch. 21 - Prob. 6PCh. 21 - 19.7 Provide a definition and an example for each...Ch. 21 - 19.10 Three pairs of genes with two alleles each (...Ch. 21 - Prob. 9PCh. 21 - 19.12 Two inbred lines of sunflowers produce...
Ch. 21 - Prob. 11PCh. 21 - 19.14 In Nicotiana, two inbred strains produce...Ch. 21 - 19.15 Suppose the length of maize ears has narrow...Ch. 21 - In a line of cherry tomatoes, the average fruit...Ch. 21 - 19.17 Two purebreeding wheat strains, one...Ch. 21 - Prob. 16PCh. 21 - During a visit with your grandparents, they...Ch. 21 - 19.20 An association of racehorse owners is...Ch. 21 - Prob. 19PCh. 21 - Suppose a polygenic system for producing color in...Ch. 21 - New Zealand lamb breeders measure the following...Ch. 21 - Cattle breeders would like to improve the protein...Ch. 21 - In human gestational development, abnormalities of...Ch. 21 - The children of couples in which one partner has...Ch. 21 - Answer the following in regard to multifactorial...
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- The narrow-sense heritability of ear length in Reno rabbits is 0.4. Thephenotypic variance (VP) is 0.8, and the environmental variance (VE) is0.2. What is the additive genetic variance (VA) for ear length in theserabbits?arrow_forward1. Consider this graph on running speed in huskies Midosspring running speed (m/s) 16 14 12 10 8 + 2 Husky running speed 4 6 8 Midparent running speed (m/s) 10 12 14 16 a. Approximately what is the heritability of running speed in this kennel of huskies? (You can approximate by eyeballing from the graph, no need to calculate the actual slope) b. If the breeder where to selectively breed the dogs, will the dogs run substantially faster in the next generation? c. What else can the breeder do to increase running speed?arrow_forwardIn a population of 1,000 squirrels, 60 are melanistic. Agouti fur (each hair displays two or more bands of pigmentation) is dominant over melanistic fur (excess of pigmentation that leads to a dark, often almost black fur). How often is agouti fur expressed? 0.25 0.75 0.9375 0.06arrow_forward
- The 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_forwardVariance in back fat & body length were calculated in a heard of hogs and summarized in the table below. Trait In hogs Back fat Body length Vp 24.5 48.2 VG 15.5 28.4 VA 7.0 12.6 Calculate the narrow-sense heritability for body length, and provide an answer with 2 places behind the decimal. [h²] (Enter an answer with 2 or 3 significant figures)arrow_forwardIn a wild strain of tomato plants, the phenotypic variance fortomato weight is 3.2 g2. In another strain of highly inbred tomatoesraised under the same environmental conditions, the phenotypicvariance is 2.2 g2. With regard to the wild strain,A. Estimate VG.B. What is hB2?C. Assuming that all of the genetic variance is additive, what is hN2?arrow_forward
- 1) Narrow sense heritability of withers height in a population of quarter horses is 17%. The average withers height in this population is 17.5 hands (1 hand is equal to 4 inches). From this population, studs and mares with average withers height of 19.8 hands are selected as parents for the next generation. 1a) Calculate the selection differential and expected response to selection for withers height in this population. 1b) What should be the average withers height in the progeny of the selected animals?arrow_forwardThe following variances were calculated for two traits in a herdof hogs.Trait VP VG VABack fat 30.6 12.2 8.44Body length 52.4 26.4 11.70 Calculate broad-sense (H2) and narrow-sense (h2) heritabilitiesfor each trait in this herd.arrow_forwardOne 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_forward
- Drosophila buzzati is a fruit fly that feeds on rotting fruits of cacti in Australia. The broad-sense heritability of body size (thorax length) was calculated from a natural population of the fruit flies, and was 0.3. If the phenotypic variance was 5, what is the genetic variance?arrow_forwardWhat is the predicted response to selection (R) if the narrow-sense heritability, h2, is 0.5 and the selection differential (S) is 0.8? (Your answer should be in the following format, e.g. 0.1)arrow_forwardIf 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.arrow_forward
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