Based on the phylogenetic tree in Figure 28.2, which of the following statements is correct?
(A) The most recent common ancestor of Excavata is older than that of SAR.
(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.
The statement “the most recent common ancestor of Excavata is older than that of SAR” is incorrect.
The statement “the most recent common ancestor of SAR is older than that of Unikonta” is incorrect.
The statement “the most basal (first to diverge) eukaryotic supergroup cannot be determined” is correct.
The statement “Excavata is the most basal eukaryotic supergroup” is incorrect.
Video Transcript
Let's talk about the periodic file a genetic tree. So the understanding of the evolutionary history of Eukaryotic diversity has been influx, especially in recent years. There are ongoing changes in our understanding of the biology of protests, and this poses Ah lot of challenges. There are a lot of different hypotheses about these relationships, and it's been a focus of scientific activity, which that's the marvelous part about science is our understanding is always always changing. So we know in this tree that there is no the root of the eukaryotic tree is not known. So all for super groups harsh being shown as diverging from one common ancestor. We know this is not correct, but we don't know which supergroup was the first to diverge from the other three. In addition, there have been major new groups of protests that have been discovered in recent years, but their relationship to thes super groups has yet to be resolved
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Terms in this set (50)
What is thought to be the correct sequence of these events, from earliest to most recent, in the evolution of life on Earth?
1. origin of mitochondria 2. origin of multicellular eukaryotes
3. origin of chloroplasts 4. origin of cyanobacteria
5. origin of fungal-plant symbioses
A) 4, 3, 2, 1, 5 B) 4, 1, 2, 3, 5 C) 4, 1, 3, 2, 5 D) 4, 3, 1, 5, 2 E) 4, 3, 1, 2,
5
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