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Ch. 25 - Quantitative Genetics and Multifactorial Traits

Chapter 24, Problem 12

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 broad-sense (H²) and narrow-sense (h²) heritabilities for each trait in this herd.

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Hey everyone. Let's take a look at this question together. Which of these assertions regarding heritability is true. So let's take a look at the following assertions and recall what we've learned about heritability to figure out which one is true. Starting off with answer choice A. It says the proportion of additive Jenna typical variants to for in a typical variance is measured by broad sense heritability. Immediately we know that this one is incorrect because that proportion of this additive genetic variance to fanatic variance is not measured by broad sense heritability and is measured by narrow sense heritability. So answer choice A. Is incorrect because we know that the narrow sense heritability formula is that H. Two equals Visa A. Over Visa V. And not the broad sense heritability. Answer choice B says twin studies can provide insight into the narrow sense of human trait heritability. This one is also incorrect because twin studies can provide insight into the broad sense of human trait heritability. Because this additive genetic variance and phenotype variance from the first answer choice, that is the narrow sense heritability can't be measured in twins. So answer choice B. Is incorrect, which means we can actually cross off answer choice D. And that means that answer choice C. Is our correct answer by process of elimination. As well as the fact that we know heritability measures the extent to which genetic variants contributes to the total fanatic variation because we know that heritability is that ratio of that genetic variation to the total fanatic pick variation or a trait or character in a population. So answer choice C. Is the correct answer. I hope you found this video to be helpful. Thank you and goodbye.
Related Practice
Textbook Question

List as many human traits as you can that are likely to be under the control of a polygenic mode of inheritance.

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Textbook Question

Corn plants from a test plot are measured, and the distribution of heights at 10-cm intervals is recorded in the following table:  

 Height (cm)      Plants (no.)       

100                    20       

110                    60       

120                    90       

130                   130       

140                   180      

 150                   120       

160                    70        

170                   50        

180                   40 

Calculate 

(a) the mean height, 

(b) the variance, 

(c) the standard deviation, and 

(d) the standard error of the mean. 

Plot a rough graph of plant height against frequency. Do the values represent a normal distribution? Based on your calculations, how would you assess the variation within this population?

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Textbook Question

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

Which of the two traits will respond best to selection by a breeder? Why?

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Textbook Question

The 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.

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Textbook Question

A hypothetical study investigated the vitamin A content and the cholesterol content of eggs from a large population of chickens. The following variances (V) were calculated.

Calculate the narrow-sense heritability (h²) for both traits. <>

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Textbook Question

A hypothetical study investigated the vitamin A content and the cholesterol content of eggs from a large population of chickens. The following variances (V) were calculated.

Which trait, if either, is likely to respond to selection? <>

254
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