Why is a random mutation more likely to be deleterious than beneficial?

Video transcript

Hi everyone, welcome back. Let's look at the next question. It says which of the following mutations results in the death of an organism? Well luckily this one is pretty straightforward. We're looking for something a mutation that results in death. And we looked through our answer choices. We had a visible mutation, be conditional mutation, see lethal mutation and D. Neutral mutation. So that answer choice C lethal mutation is pretty obvious since lethal mean would mean deadly. So we have our answer choice C. But let's just walk, walk our way through our other answer choices. Choice A. Is visible mutation and that would be one that alters the phenotype of the organism. It's visible when you look at the organism because of the alteration of the phenotype but it doesn't result in death. So that's why Choice A. Is not the correct answer, then Choice B. Is conditional mutation. This one's a little bit more tricky. It is a mutation that is only detectable under certain conditions. So you see the wild type um trait under wider conditions and then you'd only see the mutation under certain restrictive conditions. An example to make that a little more clear is a temperature dependent mutation. So when where you don't see the mutant Vienna type, whatever it is, unless the temperature gets above a certain level or below a certain level. So that's a conditional mutation. But again, we were looking for one that resulted in death. And finally a neutral mutation and as one might assume by its name neutral. It is a mutation that has no observable effect on the organism. So obviously that one does not cause death. So that's why choice D. Isn't correct. So again, which of the following mutations results in the death of an organism? I see lethal mutation in the next video.