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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 4

Chapter 24, Problem 4

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

How many additive alleles are needed to produce each possible phenotype?

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Hey everyone. Let's take a look at this question together. Which of the following types of inheritance is typically responsible for traits that exhibit continuous fanatic variation. Let's recall what we've learned about the following types of inheritance. To figure out which one is typically responsible for traits that exhibit continuous fanatic variation. But we know the continuous phenotype variation refers to multiple jeans being involved in the expression of traits. So in trait expression, for example, the height of a person can be influenced by many genes and it can vary significantly by a small degree. So looking at the types of inheritance which one best represents that continues fanatic variation. Well, we know that only one type here involves those multiple genes and that is answer choice B. Polly jean inheritance because polly jean inheritance is a type of inheritance in which a variety of fanatic variations are caused by the involvement of multiple greens. And they are involved in that expression of a trait. So answer choice B. Is the correct answer. And we know it is not the other options because answer choice A sex linked inheritance has a phenotype that is determined by the presence or absence of a gene on the sex chromosome. So it is not A. It is not multiple illegal inheritance because that phenotype is determined by the dominance Of 10. Leo over the other. So that is incorrect. And lastly answer choice D. Is incorrect because incomplete dominance has a phenotype that is a blend of two wheels. And so answer choice B is the only one here that represents traits that exhibit continues for genetic variation, so it 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

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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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

Based on the ratios in the F₂ population, how many genes are involved in the production of color?

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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

Predict the outcome of the  and  generations in a cross between a true-breeding medium-red plant and a white plant.

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Textbook Question

Height in humans depends on the additive action of genes. Assume that this trait is controlled by the four loci R, S, T, and U and that environmental effects are negligible. Instead of additive versus nonadditive alleles, assume that additive and partially additive alleles exist. Additive alleles contribute two units, and partially additive alleles contribute one unit to height.

Can two individuals of moderate height produce offspring that are much taller or shorter than either parent? If so, how?

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Textbook Question

Height in humans depends on the additive action of genes. Assume that this trait is controlled by the four loci R, S, T, and U and that environmental effects are negligible. Instead of additive versus nonadditive alleles, assume that additive and partially additive alleles exist. Additive alleles contribute two units, and partially additive alleles contribute one unit to height.

If an individual with the minimum height specified by these genes marries an individual of intermediate or moderate height, will any of their children be taller than the tall parent? Why or why not?

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