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Ch. 25 - Quantitative Genetics and Multifactorial Traits

Chapter 24, Problem 2

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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Hello everyone and welcome to today's video. So which of the following statements regarding the characteristics of apologetic inheritance is incorrect. Remember that We're looking for the false statement and modern answer chases So impala genic traits. Many genes control a single trade. Well here we have polly and then genic polly refers to many genic refers to genes. So many genes control a single trade is a correct statement. So we're going to cancel that up because we're looking for the incorrect one. Then we have it follows a pattern of non medallion inheritance or since multiple genes are affecting a single trade, this definitely follows a pattern of non mammalian inheritance. So we're also going to cancel this out because it is a correct statement that we have the apologetic trades exhibit a continuous variation of the trade in a population. So again, because they are being affected by multiple jeans, they're going to be exhibiting something called continuous variation. So this is correct as well and we're going to cancel this out. Then we have seen Human eye color, skin color and blood group are examples of apologetic traits. This question is actually partially correct. Okay, so human eye color and skin color actually in fact examples of apologetic inheritance. However, blood group, although there are multiple genes being involved, it is not an example of palla genic inheritance. That is not how it is inherited because of this. This is going to be an incorrect statement and we're going to highlight it as a final answer to our question. I really hope this helped you and I hope to see you on the next one.
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:

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

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

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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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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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