Three pairs of genes with two alleles each (A₁ and A₂, B₁ and B₂,...

Question

Three pairs of genes with two alleles each (A₁ and A₂, B₁ and B₂, and C₁ and C₂) control the height of a plant. The alleles of these genes have an additive relationship: Each copy of alleles A₁, B₁, and C₁ contributes 6 cm to plant height, and each copy of alleles A₂, B₂, and C₂ contributes 3 cm.

What height is expected in the F₁ progeny of a cross between A₁A₁B₁B₁C₁C₁ and A₂A₂B₂B₂C₂C₂.

Accepted Answer

Hey, everyone. Let's take a look at this question together when many pairs of genes control a single trait of a plant and show additive relationship where each AO contributes quantitatively to the trait. It is referred to as what is it? Answer choice, a heritability answer choice B genetic correlation, answer choice C polygenic trait or answer choice D genetic variants. Let's work this problem out together to try to figure out which of the following answer choices is the correct answer. So something that should stand out to you in the question is that we are talking about many pairs of genes controlling a single trait. And so when we have traits that are influenced by many genes, they are often controlled by several low, each with small effects and each of these small effects add up to the resulting phenotype since they show an additive relationship where each allele contributes quantitatively to the trait. And some examples in plants include plant height, plant yield and disease resistance. And since we are talking about those many pairs of genes, another term for many pairs of jeans is the term polygenic where that prefix poly means many. And so polygenic or many genes is a term that we use to describe something involving many genes. And in this case, we're talking about traits that are influenced by many genes. So a trait that is influenced by many genes often controlled by several loci. Each with small effects is answer choice. C polygenic trait. The correct answer because polygenic traits are influenced by multiple genes and are often controlled by several loci each with small effects. And some examples of those polygenic traits are the plant height, the yield or the disease resistance. So answer choice C polygenic trait is the correct answer. I hope you found this video to be helpful. Thank you and goodbye.

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