Homology can be defined as the presence of common structures beca...

Question

Homology can be defined as the presence of common structures because of shared ancestry. Homology can involve genes, proteins, or anatomical structures. As a result of 'descent with modification,' many homologous structures have adapted different purposes.

Is it likely that homologous proteins from different species have the same or similar functions? Explain.

Accepted Answer

Hi everyone welcome back. Here's our next problem. Homologous sequences are considered to be or thala Ghous if they were separated by and when we look at our answer choices. Let's note that we do have choice D all options are correct. So there's the possibility that more than one of those answer choices is correct. Let's recall from our content video that homologous sequences are DNA sequences that are similar in their D. N. A sequence and in the function of the protein that they code for due to descent from a common ancestor. So what makes homologous sequences or thala Ghous? And that's if they are separated by and we can look over at our answer choices and we see that we have choice be speciation event. And that does describe what makes homologous sequences or thala Ghous. So two species have diverged from each other and yet retain and conserve this similar function and sequence of this D. N. A. And that D. N. A. Is due to that D. N. A. Sequence is descended from a single gene in the last common ancestor. So I just marked it here because we do have that choice D available. So let's look at our other answer choices just to see if any of the others are also correct. Troy say says a duplication event but this is not correct. Um When two sequences are homologous because they're due to gene duplication in a single organism that would be called parallel agus corporal agus not or thala Ghous. So choice A is not correct. That means that choice D is also not our answer. since we don't have all the options, correct. So we can go ahead and say that choice B is our answer. And just to be thorough look at choice C point mutations. What point mutations are, of course those mutations that change just a single base pair in D. N. A. And that isn't what separates DNA sequences. It's just a change that occurs to D. N. A. So that's not a correct answer. So again, homologous sequences are considered to be ornithologists. If they were separated by choice, be speciation event. See you in the next video.

Key Concepts

Homology

Descent with Modification

Protein Function and Evolution

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