Strains of petunias come in four pure-breeding colors: white, blue, red, and purple. White petunias are produced when plants synthesize no flower pigment. Blue petunias and red petunias are produced when plants synthesize blue or red pigment only. Purple petunias are produced in plants that synthesize both red and blue pigment (the mixture of red and blue makes purple). Flower-color pigments are synthesized by gene action in two separate pigment-producing biochemical pathways. Pathway I contains gene A that produces an enzyme to catalyze conversion of a colorless pigment designated to blue pigment. In Pathway II, the enzymatic product of gene B converts the colorless pigment designated to red pigment. The two genes assort independently.
What are the possible genotype(s) for pure-breeding red petunias?

Question

Strains of petunias come in four pure-breeding colors: white, blue, red, and purple. White petunias are produced when plants synthesize no flower pigment. Blue petunias and red petunias are produced when plants synthesize blue or red pigment only. Purple petunias are produced in plants that synthesize both red and blue pigment (the mixture of red and blue makes purple). Flower-color pigments are synthesized by gene action in two separate pigment-producing biochemical pathways. Pathway I contains gene A that produces an enzyme to catalyze conversion of a colorless pigment designated to blue pigment. In Pathway II, the enzymatic product of gene B converts the colorless pigment designated to red pigment. The two genes assort independently.

What are the possible genotype(s) for pure-breeding red petunias?

Diagram showing pigment pathways for petunia flower colors: white, blue, red, and purple.

What are the possible genotype(s) for pure-breeding red petunias?

Accepted Answer

Hello everyone and welcome to today's video. So we have packets and we have two genes B and why that contribute to two different pigment producing bio synthetic pathways that produce either blue or yellow pigment. Now, the wall type era kids have feathers that are green with a mixture of blue and yellow. They are also found to have blue feathers and these blue feathers occur due to the absence of the yellow pigment and they also have yellow feathers which occur due to the absence of the blue pigment. This is very important to solve the problem. They also have white feathers which is the absence of both pigments. Using these information, determine the genotype of pure reading blue parakeets. Well, before we jump into our answer choices, we need to understand that if these organisms are pure breathing, they're going to be purely Homo sagas. Knowing this. Let's look over to our answer choices and eliminate any hetero sickos answer choices because this cannot be pure breeding. In this case, this is going to be answer choice B moving on. Let's not analyze the last sentence of or text here using this information to determine the genotype of pure breeding blue parakeets. We already know that they're going to be Homo Sagas for both genes, but remember that they are going to be blue. Now, if we look at our text, we can see that if they have blue feathers, this is due to the absence of the yellow pigment. If they don't have the yellow pigment, they're going to be Homos, ikea's recessive for yellow, meaning that they lack yellow in their feathers. Now, if they're going to be blue parakeets, they're going to have the blue pigment, meaning that they're going to be home on Sega's dominant for the blue pigment, meaning that they have blue in their feathers. And after doing this, we have come up with this pure breeding Genotype four Blue Park kids that if we look at our answer choices, it's going to be represented by answer choice. CI really hope this video helped you and I hope to see you on the next one.

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Key Concepts

Gene Action and Biochemical Pathways

Independent Assortment

Pure-Breeding Genotypes