An organism having the genotype AaBbCcDdEe is self-fertilized....

Question

An organism having the genotype AaBbCcDdEe is self-fertilized. Assuming the five genes assort independently, determine the following proportions:

Progeny that are expected to have a phenotype identical to that of the parent.

Accepted Answer

Hi, everyone. Welcome back. Let's look at our next question. It says, suppose we have a purple, big C and tall big D P plant that is dominant over white and short variants. If a pea plant with a big C little C, big D, little D genotype is allowed to self fertilize how many purple offspring will be produced. Assuming they follow independent assortment. And our answer choices are choice. A 12 16th, B 26th C 5/16 or D 9/16. Well, when we look at our cross here, we have, the two parents are going to be identical since it's self fertilizing heterocyclic in both traits. So big C little C, big D, little D across the big C, little C, big D, little D. And When we look at the possibilities for offspring, we could do a giant Punnett square with 16 squares showing all our possibilities. However, we can note that we're only being asked about one trait which is color. We're not being asked for outcome with both traits. Since we know that the traits, independent, two genes independently assort, we can look at this as a mono hybrid cross and look at the expected genotype ratio for model hybrid cross heterocyclic for just one trait, which is one, 2, 2, 2, 1 one being the homos, I guess dominant to being hetero sickness and the other one being homeless, I guess, recessive offspring were asked to look at how many purple offspring will be produced. And since purple is the dominant trait, we know that the purple offspring will have Jenna types of Hamas, I guess dominance. So big C big C or headers, I guess big C little C. So when we look at what proportion of the offspring will be purple and look at our expected genotype ratio, we're going to add together the possibilities for homos, I guess dominant or hetero sickness. So one plus three, excuse me, one plus two, which is three out of four possible outcomes for the mono hybrid cross 3/4. Now we're going to scale that up looking at since our answer choices are in 16th, 3/4 is equal to 12 16th. So that's going to be our answer. And we'll look over here back at the answer choices and the recall, the choice a is 12/16. So if we have a P plant with big C little C big D little D genotype allowed to self fertilize how many purple offspring will be produced assuming they follow independent assortment. And again, we can look at, it's only looking at one trait so we can uh look at just a mono hybrid cross to look at these outcomes. And that gives us our answer of choice. A 12/16. See you in the next video.

An organism having the genotype AaBbCcDdEe is self-fertilized. Assuming the five genes assort independently, determine the following proportions:

Progeny that are expected to have a phenotype identical to that of the parent.

Key Concepts

Independent Assortment

Genotype and Phenotype

Punnett Square

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