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Ch. 25 - Quantitative Genetics and Multifactorial Traits
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All textbooksKlug 12th EditionCh. 25 - Quantitative Genetics and Multifactorial TraitsProblem 9

Chapter 24, Problem 9

What kind of heritability estimates (broad sense or narrow sense) are obtained from human twin studies?

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Everyone. Let's take a look at this question together. What is narrow sense heritability. And we know that the formula for narrow sense heritability is given as H. two equals V. A. Over B. P. And it refers to the ratio of additive genetic variance over the total, you know, typical variants. And it gives us an indication of how much the total fanatic variance is due to genetic factors. Which means that answer choice A. Is the correct answer. Because you know that narrow sense heritability gives us that proportion of variation in a trait due to genetic factors. And now environmental factors as well as it's not the total amount of variation in a trait within a population as well as degree to which two traits are correlated. So answer choice is B. C. And D. Are incorrect and answer choice A. Is the correct answer. I hope you found this video to be helpful. Thank you and goodbye.
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Related Practice
Textbook Question

Erma and Harvey were a compatible barnyard pair, but a curious sight. Harvey's tail was only 6 cm long, while Erma's was 30 cm. Their F₁ piglet offspring all grew tails that were 18 cm. When inbred, an F₂ generation resulted in many piglets (Erma and Harvey's grandpigs), whose tails ranged in 4-cm intervals from 6 to 30 cm (6, 10, 14, 18, 22, 26, and 30). Most had 18-cm tails, while 1/64 had 6-cm tails and 1/64 had 30-cm tails. Explain how these tail lengths were inherited by describing the mode of inheritance, indicating how many gene pairs were at work, and designating the genotypes of Harvey, Erma, and their 18-cm-tail offspring.

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Textbook Question

Erma and Harvey were a compatible barnyard pair, but a curious sight. Harvey's tail was only 6 cm long, while Erma's was 30 cm. Their F₁ piglet offspring all grew tails that were 18 cm. When inbred, an F₂ generation resulted in many piglets (Erma and Harvey's grandpigs), whose tails ranged in 4-cm intervals from 6 to 30 cm (6, 10, 14, 18, 22, 26, and 30). Most had 18-cm tails, while 1/64 had 6-cm tails and 1/64 had 30-cm tails. If one of the 18-cm-tail F₁ pigs is mated with one of the 6-cm-tail F₂ pigs, what phenotypic ratio will be predicted if many offspring resulted? Diagram the cross.

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Textbook Question

In the following table, average differences of height, weight, and fingerprint ridge count between monozygotic twins (reared together and apart), dizygotic twins, and nontwin siblings are compared:   Trait            MZ Reared    MZ        DZ Reared   Sibs Reared                     Together      Reared     Together       Together                                          Apart                                              _Height (cm)      1.7              1.8             4.4                4.5 Weight (kg)      1.9               4.5            4.5                4.7 Ridge count     0.7               0.6            2.4                 2.7 Based on the data in this table, which of these quantitative traits has the highest heritability values?

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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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