Under what circumstances might a lethal dominant allele ...

Question

Under what circumstances might a lethal dominant allele persist in a population?

Accepted Answer

Hello, everyone and welcome to today's video. So which type of selection makes the beneficial mutations become more prevalent? Well, remember that mutations are usually going to favor one way or the other or they could favor both really depends on the type of mutation. So knowing that let's go over each of the type of selections that we're going to be observing in nature in order to select the correct one. So first of all, we have balancing selection. So balancing selection has this name because it's going to balance the population by favorite both Leo's. So since both Leos are going to be favor if wanna Leo has a beneficial mutation and the other one doesn't, both are going to be favored, both are going to be at the same number. So we're going to cancel this out because we're looking for the one that's going to benefit to benefit specifically the beneficial mutations. So then we have seen Directional selection. This here is going to be benefiting or selecting one of the elite. However, we don't know if this could be the beneficial one or the deleterious one really depends on what the hell is providing. So we're going to cancel this out as well and then we have purifying selection. Well, this could be argued that it's right because it is going to completely remove the deleterious a little from the population. But here, this is not what the question is asking for. It is not asking which mutation or which side of selection is going to completely remove the deleterious. A Leo is asking for which one is going to make the beneficial mutation more prevalent, not just the one that is the only one that exists because of this, we're going to be able to eliminate purifying selection from our answer choices. And then finally, we have positive selection. Positive selection works a lot like purifying selection. However, instead of eliminating the deleterious one is going to make the beneficial one Or the positive one like its name implies more prevalent without eliminating the -1, which is why we cannot select this purifying selection. So here answer choice B is going to be the correct one for a question and we're going to select that as the final answer. So I really hope this video helped you and I hope to see you on the next one.

Under what circumstances might a lethal dominant allele persist in a population?

Key Concepts

Lethal Dominant Alleles

Incomplete Penetrance

Age of Onset

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