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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 1

Chapter 24, Problem 1

How can we ascertain the number of polygenes involved in the inheritance of a quantitative trait?

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Everyone. Let's take a look at this question together how many polly genes generally contribute to a quantitative trait. So let's recall what we mean by quantitative trait to figure out how many polly genes are contributing to it. So when we talk about a quantitative trait, we're basically talking about quantitative features such as height or wait. Because these features are influenced by a number of genes that work together, each of which has a minor effect on the final phenotype. And the genes that are involved in these traits are those poly genes. And because of many factors that contribute to that trait is difficult to figure out the exact number. So it is answer choice C. Multiple because there are multiple palla genes that contribute to that quantitative trait, for instance height or weight. So answer choice C. 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

In this chapter, we focused on a mode of inheritance referred to as quantitative genetics, as well as many of the statistical parameters utilized to study quantitative traits. Along the way, we found opportunities to consider the methods and reasoning by which geneticists acquired much of their understanding of quantitative genetics. From the explanations given in the chapter, what answers would you propose to the following fundamental questions:

How do we assess environmental factors to determine if they impact the phenotype of a quantitatively inherited trait?

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Textbook Question

In this chapter, we focused on a mode of inheritance referred to as quantitative genetics, as well as many of the statistical parameters utilized to study quantitative traits. Along the way, we found opportunities to consider the methods and reasoning by which geneticists acquired much of their understanding of quantitative genetics. From the explanations given in the chapter, what answers would you propose to the following fundamental questions:

What findings led geneticists to postulate the multiple-factor hypothesis that invoked the idea of additive alleles to explain inheritance patterns?

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Textbook Question

How do we know that threshold traits are actually polygenic even though they may have as few as two discrete phenotypic classes?

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Textbook Question

Write a short essay that discusses the difference between the more traditional Mendelian and neo-Mendelian modes of inheritance (qualitative inheritance) and quantitative inheritance.

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Textbook Question

Define the following: (a) polygenic, (b) additive alleles, (c) correlation, (d) monozygotic and dizygotic twins, (e) heritability, (f) QTL, and (g) continuous variation.

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Textbook Question

A dark-red strain and a white strain of wheat are crossed and produce an intermediate, medium-red F₁. When the F₁ plants are interbred, an F₂ generation is produced in a ratio of 1 dark-red: 4 medium-dark-red: 6 medium-red: 4 light-red: 1 white. Further crosses reveal that the dark-red and white F₂ plants are true breeding

Assign symbols to these alleles, and list possible genotypes that give rise to the medium-red and light-red phenotypes.

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