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.

Identify all possible genotypes for plants with an expected height of 33 cm.

Accepted Answer

Hey, everyone. Let's take a look at this question together. When the number of blank increases, the number of phenotypic categories also increases. Is it answer choice? A complementary genes, answer choice B, supplementary genes, answer choice C additive genes or answer choice D sex linked genes. Let's work this problem out together to try to figure out which of the following answer choices is the correct answer. So when we're talking about genes that can increase the number of phenotypic categories, we are referring to genes that contribute to the phenotype in a cumulative and additive manner. And what we mean by the word additive is that each additional allele adds to the phenotype. For example, height, which is a polygenic trait that is controlled by multiple additive genes. And so what we're looking for in our answer, choice is genes that contribute to the phenotype in a cumulative and additive manner or genes that add to the phenotype, which describes additive genes. Because additive genes are genes that contribute to the phenotype in a cumulative and additive manner, meaning that each additional allele adds to the pheno type. So that means that answer choice C additive genes is the correct answer. Because when the number of those additive genes increases, the number of phenotypic categories also increases because each additional allele of an additive gene has a certain amount to the phenotype. So answer choice, C additive genes is the correct answer. I hope you found this video to be helpful. Thank you and goodbye.

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