MAKE CONNECTIONS In Figure 33.7, assume that the two medusae shown at step 4 were produced by one polyp colony. Review Concept 12.1 and Concept 13.3, and then use your understanding of mitosis and meiosis to select which of the following is true. (A) Both the medusae and the gametes are genetically identical. (B) Neither the medusae nor the gametes are genetically identical. (C) The medusae are not genetically identical but the gametes are genetically identical. (D) The medusae are genetically identical but the gametes differ genetically.

Video transcript

Welcome back. Let's look at our next problem. A sexual and sexual phases alternate in obey leah with one producing the other assume a polyp produces two genetically identical medusa but the gametes released by these medusa are genetically distinct based on this information, identify the mode of reproduction in the polyps and medusa of Amelia. Well, one really important thing to note when we read this problem is that it says here based on this information. So we don't need to remember what the organism amelia is. We don't need to understand what a polyp or medusa is anatomically. We only need the information provided in this problem. So let's look at that. We see that we have alternating a sexual and sexual phases. And when we look at our answer choices, we have to identify which mode the polyps are using, In which mode the medusa are using. So we'll just set up our notes here with polyps Medusa and what information is given to us. In the problem, we see that the polyp produces two identical medusa. And then we look at the medusa, it says the gametes released by these medusa are genetically distinct. So we don't have a specific number. We just see that we have genetically distinct gametes. Well, when we think about sexual and a sexual reproduction, we think about sexual reproduction being a result of the process of mitosis. And as we recall a sexual reproduction most often the result of mitosis. So as we can recall from our content. Videos mitosis is when a cell divides twice and the end result is four daughter cells that are half Lloyd. They have half the number of chromosomes as the parent cell. And most importantly they are genetically different because they have only half the chromosomes that the parents all had. And so the different daughter cells can have different chromosomes from each other. A sexual reproduction through mitosis gives us two daughter cells that are genetically identical. So with that knowledge, we can look back here, polyps give us two identical menus that must be through the process of mitosis and therefore a sexual reproduction. The medusa give us distinct gametes doesn't give us a number here. But if we have genetically distinct gametes with those half Lloyd number of chromosomes, we must be looking at me aosis oh sis. And therefore sexual reproduction. And we could have taken a little shortcut looking at our answers. If we looked right away and say Medusa have distinct gametes genetically distinct, we know that a sexual reproduction does not produce sexually distinct offspring. So we could have automatically eliminated any choice that showed Medusa II, which produced distinct gametes as being a sexual reproduction. So that would be A and C. So we could have eliminated those right away. Let's look here we want to see which answer choice has correctly matched polyps with a sexual reproduction. Medusa with sexual reproduction and the answer is B. Has that correct match up because Choice D. Has polyps with sexual reproduction. That can't be correct since and Medusa with sexual but the polyps, as we see, produce two identical medusa. So Choice D is not correct. Our correct answer be as polyps as a sexual Medusa as sexual. See you in the next video.