Based on the phylogenetic tree in Figure 28.5, which of the follo...

Question

Based on the phylogenetic tree in Figure 28.5, which of the following statements is correct?
(A)Excavata and SAR form a sister group.
(B)The most recent common ancestor of SAR is older than that of Unikonta.
(C)The most basal (first to diverge) eukaryotic supergroup cannot be determined.
(D)Excavata is the most basal eukaryotic supergroup.

Accepted Answer

Hello everyone. Let's look at our next problem. Given below is a philo genetic tree of all organisms that involve a common ancestor. And it says which statement correctly describes this villa genetic tree. So let's walk through our choices here. Choice A says excavator and sar as they are formed sister groups. So let's find these on their tree. There they are. And we see that they are sister groups. They're next to each other on their tracing back to a common ancestor. So that is correct. And we'll just highlight that choice a correct excavator answer sister groups. So let's go to the next choice. The next one is choice be unique. Conta is the most basal group. Let's find yuna. Conta here. There we go. But you know conta is not the most basal group. You can see all the things here that are a part of it um have a common ancestor before the top of the tree there. Whereas excavate to appear and S. A. R. And R. K. Plastic are all more basil than that. You know, contact group. So that is not a correct answer and we can eliminate choice B. Choice C. Says animals and fungi do not belong to you know Conta. However when we look here and find animals and fungi they are a part of this unique contact group. So that is also not a correct answer there. So we'll just cross that out and D. X. Nevada is the most recent eukaryotic supergroup. Well that's also incorrect. We can see your ex Nevada going all the way back to the common ancestor of all of them. So that is also not correct that. And remind ourselves that are correct, answers A X, Nevada and S A. R form sister groups. See you next time.

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