EVOLUTION CONNECTION DRAW IT Draw a phylogenetic tree that represents our current understanding of evolutionary relationships between a moss, a gymnosperm, a lycophyte, and a fern. Use a charophyte alga as the outgroup. (See Figure 26.5 to review phylogenetic trees.) Label each branch point of the phylogeny with at least one derived character unique to the clade descended from the common ancestor represented by the branch point.

Video transcript

Hi everyone, let's look at our next problem. The figure below shows a fila genetic tree that represents our current understanding of evolutionary relationships between a moss, a gymnast spurn a like a fight and a. For then we have a diagram of our tree here and then it says which one of the following is the correct statement regarding the above evolutionary tree. So let's evaluate our statements here. So let's look at Choice A all plants and green algae don't have a common origin. So looking up at our tree with our plants and algae, we trace it back here and but we see that the entire tree does have a common ancestor over here in branch one. So Choice A. Is not a correct statement so we can eliminate that as our answer. Now let's look at Choice B. All plants and green algae share A common ancestor from Branch one. Well we saw in our previous statement that branch one is the common ancestor of the entire tree. So Choice B. That's correct. Now let's look at choice. See here, Choice C. Says Burns and Jim. No sperms evolved from a common ancestor from branch four. Well let's look up here, we're going to locate the ferns and jim no sperms on our tree right there ferns and jim no sperms. And when we look here they do have a common ancestor but their common ancestor is branch three not branch four. Branch four is only the ancestor of gymnast firms. So we know that choice C. Is also not a correct statement. So let's eliminate that. So let's finally let's look at Choice D. Choice D. Says ferns and mosses share a common ancestor from branch three. So again, look up here, we're gonna find mosses and ferns And look at Branch three. But while branch three is an ancestor of ferns, it is not the ancestor of mosses, their common ancestor is branch to instead. So Choice D. Also incorrect. We can eliminate that and we have our confirmed our correct answer choice B plants and green algae share a common ancestor from branch one. Hope to see you in the next video.