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Ch. 25 - Phylogenies and the History of Life
All textbooksFreeman 8th EditionCh. 25 - Phylogenies and the History of LifeProblem 6
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Chapter 24, Problem 6

You can use a 'one-snip test' to identify monophyletic groups—meaning that if you 'cut' any branch on a tree, everything that 'falls off' is a monophyletic group. Why is this valid?

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Hello everyone and welcome to today's video. So um on athletic group in a fella ginny is composed of in order to solve this problem, I want you to first visualize a fella ginny. If we want this fella ginny to be um anaphylactic group, we need to include the most recent common ancestor, but we also need to include all of the descendants. And this will create what we call a clade. So let's let's set some examples. If we wanted to include the entire file a genie and create what we call this mon affiliated group, then we will have to include the most recent common ancestor of the fila ginny and all of its descendants. Let's say that we don't want to include the entire fella ginny. Let's say that we only want A to B. To form this monopolistic group, then we will have to include the most recent common ancestor of A to B, and then the groups A and B. So this is what it will look like. This will form what we call a clade and that would be the answer to our question. So um anaphylactic group would include the most recent common ancestor and all of its descendants. There's going to be the final answer to our video and health is healthy
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