How are hypotheses about the evolutionary relationships among living organisms tested?

Video transcript

Hello everyone. And in today's video we have the following problem. So which one of the following is the best way to evaluate the hypothesis about the follow genetic relationships among different organisms. Now let's just jump over answer choices to solve this problem. Beginning by answer choice. C by cloning different organisms. Remember that when you clone a living organism we create just an exact copy in terms of D. N. A. And features of that initial organism. This is not going to help us establish relationships of different organisms because we have the exact same organisms at the end of the process, we're going to cancel this out. Then we have option B by comparing their biological processes. Well this is this actually can be used and it is used in the real world. And this is called comparative embryology. And the way that this works is that we compare human for example and fish embryos. And we see that there is a certain relationship. They just share certain features and we can establish fella genetic relationships among them. However, this is not going to be the best way to establish these relationships because there are subtle relationships that exist very deep hidden in the DNA of sequences of organisms and the sequences these differences may not be present in the embryos. So we would miss them if we use this process. However everything relating an organism is present in its D. N. A. And so if we compare DNA sequences of these organisms will find everything in terms of every difference and every similarity that they have. So this is the best way to establish follow genetic relationships between organisms, and it's our final answer. So thank you very much for sticking around until the end of this video, and I hope this helped you.