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 the number of different phenotypes (expected plant heights) that are possible with these three genes.

Accepted Answer

Hey, everyone. Let's take a look at this question together. The ear length of corn is controlled by two pairs of dominant poly jeans in an additive way. If the longest one is 10 centimeters in length and the shortest one is two centimeters in length, how much length is contributed by each dominant allele? Is it answer choice? A four centimeters. Answer choice. B eight centimeters, answer choice C 10 centimeters or answer choice D two centimeters. Let's work this problem out together to try to figure out which of the following answer choices is the correct answer for this question. We are going to use the variable X to represent the length contributed by each allele. And so we want to find out the length that is contributed by each dominant allele. So we have our total length and we have two pairs of dominant poly genes. So we are going to take two X plus two X since we have a pair of two genes. So we have our first pair of two genes and then we are going to add another set because we have two pairs. So we have two X plus two X and we have our second pair of two jeans and we know that the longest ear is centimeters in length, the shortest ear is two centimeters in length and the range is the longest ear minus the shortest ear. So 10 centimeters minus two centimeters, which gives us eight centimeters. So the total length will equal eight X, which means that our length is calculated as eight centimeters equals eight X minus zero. And we end up with X equals one centimeter, which means that each dominant allele contributes one centimeter to the overall length of the ear. And since we have two dominant alleles, that means that we have two multiplied by one centimeter, which equals two centimeters. So that means that answer choice, D two centimeters is the correct answer. I hope you found this video to be helpful. Thank you and goodbye.

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