Genetic Analysis: An Integrated Approach (3rd Edition)
3rd Edition
ISBN: 9780134605173
Author: Mark F. Sanders, John L. Bowman
Publisher: PEARSON
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Textbook Question
Chapter 19, Problem 24P
Cattle breeders would like to improve the protein content and butterfat content of milk produced by a herd of cows. Narrow sense heritability values are
a. Determine the selection differential (S) for each trait in this herd.
b. Which trait is likely to be the most responsive to artificial selection applied by the cattle breeders through selection of cows for mating?
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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?
In the following table, average differences of birth height, birth weight, and IQ score
between monozygotic twins (reared together and apart are compared. Based on the
data below, which quantitative trait has the lowest heritability?
Trait
Height
(cm)
Weight
(kg)
IQ
Height
Weight
O1Q
MZ
Reared
Together
Trait
Tail length
0.7
1.9
The following variances were calculated for two traits in poodles.
VA
MZ
Reared
Apart
6.3
Body length 11.7
4.5
1.9
Vp
20.1
33.4
Ve
16.2
Calculate broad sense (H²) and narrow sense (h²) heritability for each trait in this
herd.
4
In a herd of dairy cows the narrow-sense heritability for milk protein content is 0.76, and for milk butterfat it is 0.82. The correlation coefficient between milk protein content and butterfat is 0.91. If the farmer selects for cows producing more butterfat in their milk, what will be the most likely effect on milk protein content in the next generation?
Chapter 19 Solutions
Genetic Analysis: An Integrated Approach (3rd Edition)
Ch. 19 - Which of the following traits would you expect to...Ch. 19 - 19.2 For the traits listed in the previous...Ch. 19 - Compare and contrast broad sense heritability and...Ch. 19 - 19.4 In a cross of two pure-breeding lines of...Ch. 19 - 19.5 Describe the difference between continuous...Ch. 19 - Prob. 6PCh. 19 - 19.7 Provide a definition and an example for each...Ch. 19 - 19.8 What is a random sample, and why can a random...Ch. 19 - 19.9 Why is heritability an important phenomenon...Ch. 19 - 19.10 Three pairs of genes with two alleles each (...
Ch. 19 - 19.11 In selective breeding experiments, it is...Ch. 19 - 19.12 Two inbred lines of sunflowers produce...Ch. 19 - What is quantitative trait locus (QTL)? Suppose...Ch. 19 - 19.14 In Nicotiana, two inbred strains produce...Ch. 19 - 19.15 Suppose the length of maize ears has narrow...Ch. 19 - In a line of cherry tomatoes, the average fruit...Ch. 19 - 19.17 Two purebreeding wheat strains, one...Ch. 19 - Prob. 18PCh. 19 - During a visit with your grandparents, they...Ch. 19 - 19.20 An association of racehorse owners is...Ch. 19 - Prob. 21PCh. 19 - Suppose a polygenic system for producing color in...Ch. 19 - New Zealand lamb breeders measure the following...Ch. 19 - Cattle breeders would like to improve the protein...Ch. 19 - In human gestational development, abnormalities of...Ch. 19 - The children of couples in which one partner has...Ch. 19 - Answer the following in regard to multifactorial...Ch. 19 - 19.28 Suppose the mature height of a plant is a...Ch. 19 - A three-gene system of additive genes (A, B, and...Ch. 19 - 19.30 Congenital dislocation of the hip is a...Ch. 19 - A total of 20 men and 20 women volunteer to...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- 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_forwardThe 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_forwardIn 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_forward
- Three characteristics in beef cattle—body weight, fat content, and tenderness—are measured, and the following variance components are estimated: Body weight Fat content Tenderness VA 22 45 12 VD 10 25 5 VI 3 8 2 VE 42 64 8 VGE 0 0 1 In this population, which characteristic would respond best to selection? Explain your reasoning.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_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
- A population of farmed salmon average 9 pounds in weight at two years old. To select for rapid weight gain, fish with an average two-year weight of 12 pounds are selected for breeding. If the narrow-sense heritability (h²) for two-year weight in the unselected population is 0.2, what will be the average two-year weight of the offspring of the selected fish? 9.2 pounds 9.6 pounds 10.8 pounds 12.2 pounds 12.3 poundsarrow_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_forwardThe mean and variance of Corolla length in two highly strains of tabacco and their progeny are shown in the following table one parent (P1) has a short corolla and the other parent ( P2) have a long corolla calculate the broad sense heritability (H) of Corolla length in the plant Strain. Mean(mm). Variance (mm) P1 short 40.47. 3.12 P2 long. 93.75. 3.87 F1(P1×P2). 63.90. 4.74 F2(F1×F2). 68.72. 47.70arrow_forward
- In a study conducted on human height, heritability estimates that were initially done on children with an average age of 5 years old was 74%. Heritability estimates were again performed on the same individuals when they reached adulthood with an average of 40 years old. The result was 30%. Explain the results.arrow_forwardThe 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_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
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