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Which of the following is not true of natural selection? (a) Natural selection acts to preserve favorable traits and eliminate unfavorable traits. (b) The offspring...

Question

Which of the following is not true of natural selection? (a) Natural selection acts to preserve favorable traits and eliminate unfavorable traits. (b) The offspring of individuals that are better adapted to the environment will make up a larger proportion of the next generation. (c) Natural selection directs the course of evolution by preserving the traits acquired during an individual's lifetime.(d) Natural selection acts on a population's genetic variability, which arises through mut

Which of the following is not true of natural selection? (a) Natural selection acts to preserve favorable traits and eliminate unfavorable traits. (b) The offspring of individuals that are better adapted to the environment will make up a larger proportion of the next generation. (c) Natural selection directs the course of evolution by preserving the traits acquired during an individual's lifetime. (d) Natural selection acts on a population's genetic variability, which arises through mutation. (e) Natural selection may result in changes in allele frequencies in a population.



Answers

Which of the following is not an observation or inference on which natural selection is based?
\begin{equation}\begin{array}{l}{\text { (A) There is heritable variation among }} \\ {\text { individuals. }} \\ {\text { (B) Poorly adapted individuals never produce }} \\ {\text { offspring. }} \\ {\text { (C) Species produce more offspring than the environment can }} \\ {\text { support. }} \\ {\text { (D) Only a fraction of an individual's offspring may survive. }} \end{array}\end{equation}

Hello, everyone. I hope all is well. And today I will be helping you with the second problem off the Chapter 18 problems that so this question is asking which of these statements about a natural principle that points to the inevitability of natural selection is false. So let's look at these, and we'll go through all the answers and due process of elimination. So we have a most character. Six of organisms are inherited, so it is true. So if you go through my oh sis and you have the chromosomes and then, um, most of them will be passed on one from tthe E Parent, one from the male parent from the female parent. So here's the female parent, and then that will join to make a offspring and a lot of the character. Six are inherited by the offspring. Then you'll be offspring very among each other in regard to their characters. Six. Which is true, and the best way to think about this is to have a family. So if you have a family and you have three kids and say the mother has red hair and the father has brown hair, some of the kids may show the red hair characteristic and shut. Some may show the brown Some may have freckles. Some may not some maybe darker than others. And some may be able to do tan and some may not. And then you have Ah, see, that says some generations off offspring do not need to compete for resource is which is false. So that is the one that is, um um is not true. Um so the reason for this Well, let's just duty and explain why that was true. So it D says certain trades will be better represented in the next round correction, which is true. So, for example, if you need to run faster to survive, and then you have two parents that run fast, the offspring will better show that one because it's, ah, necessity to survive. But see, some generations are lost. Bring do not need to compete. Refer. Resource is so The way I like to think about this is that you have two parents, right? And then they have three offspring, right? And then these three offspring have, uh, three more right each. So each have three more. And I'm not doing all the bodies But you could imagine that they also know you originally had to. And now you then yet three. Then you had night and see if he's all multiply continually down the line, you're gonna have so many more. So, actually, as the lineage goes on and on, there will be even more competition for resources. So I hope you found this helpful, and I'll be have a great day. Thank you.

Okay, so this question talks about evolution by way of natural selection. So natural selection is basically this theory proposed by Charles Darwin that states that individuals have differing fitness is in this example of these drafts have different next, which affect their ability to reach these trees and ultimately gain food. And it that was the theory proposed by Darwin is that those who have greater relative fitness compared others will be able to survive and pass on their genes to their offspring, while those who are less fit have west relative fitness will die and not be able to pass on their genes. Um, so with that in mind, we'll go down these statements and see which ones are true and which ones aren't true. Um, regarding evolution by natural selection. So the first says variation exists within a population, and obviously this is true. In this case, drafts have different next, but there's variations in all different types of fino types. Um, so that is true. Uh, second, it says organisms compete for resource is and this is true, um, organisms in this. So in this case, giraffes are competing for food, but that is the whole basis for fitness. Those who are more fit are able to acquire more resource is and survive. So yes, organisms compete for resource is ah, Si says individuals have different reproductive success. So at first this may sound, um, slightly weird. But if we think about it, those who are fit have greater reproductive success. So these drafts that have relatively longer next compared to this, um, draft that we see right here will be able to pass on their genes to the next generation. So, yes, they have different reproductive success based on their relative levels of fitness. D says that organisms adapt due to environmental changes. And so this also true. You know, animals have adaptations and are able to evolve over time to be better suited to their environments. So this is also true, and E says species are fixed, so this would mean the species never change and they which and they do not adapt, which is a direct contradiction of d, which we know is true. So obviously we can state that e species are fixed is the false statement regarding evolution by

Here we have five statements about Darwin's very of natural selection. One of them is not part of it or folks. Oh, populations tends to over populists be in any population. There is unequal ability among individuals to survive and to reproduce, see only the best fit Individuals survive pass on their genes. De overpopulation leads to a struggle for existence or e organisms change in response to a need environment. So this is a little bit freaky. Three Answer here is E because it is not the organisms that change. Is the Marquis in evolution in on opposing view? But Darwinian evolution is based on changes over time, down the generations, so an organism can change my mutation. But it does not change in response to end in its environment, it cannot genetically adapt to its environment.

Yeah. What happens if there is a change in the environment which happens each year, and various Vienna types that have different fitness in environments that are not the same? So in this scenario, we can say what would happen is the effect of natural selection may oscillate from year to year, favoring alternative prototypes in different years. Sure. Oh!


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