Genetics: Analysis and Principles
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 1CONQ

Give several examples of quantitative traits. How are these quantitative traits described within groups of individuals?

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Summary Introduction

To review:

The examples of quantitative traits and their estimation in the group of individuals constituting a population.

Introduction:

Complex traits are the traits that are influenced by many genes and environmental factors as well. The branch of genetics that studies both complex and quantitative traits is called Quantitative genetics. These traits have proved highly beneficial to study human diseases, like diabetes, and for the betterment of agriculture. Example, traits like fruit size, adaptability of a crop towards the environmental conditions, height and length of the crop, and its yield are all governed by Quantitative trait loci (QTLs).

Explanation of Solution

Quantitative traits are the traits that are numerically determined. These are an example of complex traits. In humans, quantitative traits include weight and height, nose shape, rate of metabolism of food. These traits are determined by QTLs. QTLs are defined as the regions on the chromosome containing genes that influence the outcome of quantitative traits.

Examples of quantitative traits are as follows:

Anatomical traits- Weight, height of an individual, number of bristles present in Drosophila.

Behavioral traits- Photoperiodism and calls for mating.

Diseases- Hypertension and diabetes.

Physiological traits- Speed of flight and running and rate at which the food metabolizes.

Within the group of individuals constituting a population, quantitative traits are determined by Mean, Variance, and Standard deviation.

Mean- It is one of the statistical methods that describe quantitative traits. It given as the summation of the observation to the total count of the observations made.

X¯= XN

Where, X= Sum of all observations

N= Number of observations

X¯= Mean

Variation in a population can also be determined by using another statistical method called Variance. Variance is defined as the variation around the mean.

Vx = Vx=fi(XiX¯)2N1

Where, Vx is Variance

fi(XiX¯)2 issummation and square of difference in between each value and mean

N is Number of observations

Standard deviation (SD) is another statistical method for the measurement of quantitative traits in the population. It is defined as square root of variance.

SD=Vx

Conclusion

Therefore, it can be concluded that Quantitative traits are numerically determined, for example, height, weight, number of bristles in Drosophila and photoperiodism. Estimation of quantitative traits in a population is carried through mean, variance and standard deviation.

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Chapter 28 Solutions

Genetics: Analysis and Principles

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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