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Question

Concept map illustrating species interbreeding outcomes and reproductive barriers, featuring birds and fish images.

Accepted Answer

Hi, everyone. Let's look at our next question. What can happen if the barrier that separates the gene flow of two closely related species weakens or is removed. So, let's imagine we have our ancestral species, which is now diversed into two distinct but closely related species. They've been divided by a barrier that's prevented gene flow between them. Um Which is probably why they've diverged into two different species, but now that's either weakened or removed. So we have again, gene flow resumed between the two species. Well, here's where it's important that they're closely related because this means that interbreeding is most likely still possible. So when we look at our answer choices, we see that choice. A is a hybrid zone can be formed while hybrid is the offspring of the mating between two different species. And since these species are still closely related, they now can the genes can flow between them. They are probably closely related enough that you'll have interbreeding and you will have the zone here where you have many hybrids due to interbreeding between the two species that no longer have a barrier between them. But let's just look through our other answer choices to rule them out. Choice B says rapid speciation can occur. Well, this is sort of the opposite. Rapid speciation often often occurs when two species are separated, when that barrier is first put in place, or if you have a new habitat opened up. So it's to their advantage, to adapt in different ways to take advantage of new niches and not compete with each other. But that's not what we're gonna see here. Jo C says it will cause inbreeding. Again, the opposite will happen. Inbreeding is when you have a population that's become small enough that as the members mate with each other, you don't have enough different um individuals, you have to start having mating between close, more closely related individuals. Um But here you have new uh genes coming in different species. So you actually the opposite of inbreeding choice. D says it will result in deleterious genetic mutation. Well, there's no reason why gene in a new gene flow would cause this deleterious genetic mutation you'd see from things that might damage your DNA. And of course, interbreeding and having hybrids is not going to do that. So again, our answer, if the barrier that separates the gene flow of two closely related species weakens or is removed. Choice. A a hybrid zone can be formed. See you in the next video.

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