In a population of snails, snails with thicker shells are less likely to be preyed on by crabs than snails with thinner shells. Over time, you observe that the mean shell thickness of the population increases over successive snail generations. This is an example of None of the other answers is correct Stabilizing selection Directional selection Disruptive selection

In a population of snails, snails with thicker shells are less likely to be preyed on by crabs than snails with thinner shells. Over time, you observe that the mean shell thickness of the population increases over successive snail generations. This is an example of None of the other answers is correct Stabilizing selection Directional selection Disruptive selection

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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There are two major mechanisms that help populations evolve. The first is Natural Selection. The second is Prezygotic Isolation Genetic Drift Directional Selection Independent Assortment
Hutchinson-Gilford syndrome, is an extremely rare, progressive genetic disorder that causes children to age rapidly. Under which category does it best fit? Antagonistic pleiotropy Positive selection Selection shadow All of the above None of the above
Which of the following options best explains natural selection? * Mark only one oval. An organism with favorable genetic variations will tend to survive and breed successfully A community whose members work together utilizing all existing resources and migratory routes A population monopolizes all of the resources in its habitat, forcing other species to migrate the largest organisms in a species receive the only breeding opportunities 0000
Genetic drift differs from gene flow in that Group of answer choices genetic drift occurs at a steady, but low, rate in all populations while gene flow is largely random event occurring in small populations. genetic drift is most likely to produce a loss of genetic diversity in a population whereas gene flow will often increase genetic diversity in a population. none of these choices adequately describe the difference between genetic drift and gene flow. genetic drift is based on female choice of particular mates but gene flow is largely a product of natural selection.
Voles of two different colors, brown and gray, live on the same island. Hawks find these voles to be their primary food source. The voles are distributed through grassy areas in the north of the island and across lava flows in the south part. Which of the following is predicted by natural selection? Hawks find the voles by movement so it won't matter. A vole population that starts as a random mixture will never adapt to the environment. Brown voles are good at hiding in the grass; gray voles are excellent at climbing over lava flows. Consequently, the vole distribution will reflect the ability of hawks to identify each of them in its natural environment. If they stay as a mixed population, they will remain mixed because the two varieties will not interbreed with each other. The hawk population will be skewed toward the north side of the island
As we saw last week, population size is important. Ideally, this means you started with a lot of genetically diverse founders, but of course that isn’t always the case. In the case of the Española Galapagos tortoises it was 12 females and 2 males. So, often you have to grow your population to stabilize it and ensure there isn’t an unacceptable loss of genetic diversity over time, even if that genetic diversity is low. If you think back to the math from last week and do a little not so fancy algebra, you can see that genetic deterioration occurs at a rate that is the inverse of genetic retention, which you probably remember is 1- (1/2Ne) Assume that the Española Galapagos tortoise captive population started with an Ne/N ratio of 0.7. Calculate their rate of loss of genetic diversity given their original population size of 14 tortoises (N=14). You will first need to solve for Ne, then plug Ne into the rate of loss of genetic diversity formula. Now let’s work on growing the population.…
In a population of frogs, individuals with green coloration are camouflaged on leaves and are less likely to be eaten by predators. However, as the number of green frogs increases, predators learn to search for them more effectively, making it advantageous to be a less common color. What type of selection is occurring in this scenario? Disruptive selection 8888 Positive frequency-dependent selection Stabilizing selection Negative frequency-dependent selection Directional selection
If one extreme phenotype makes up most of a population after directional selection, what happened to the individuals with the other phenotypes?
Which of the following are factors that can impact genetic variation in a population? (Select all that apply.) Lack of natural selection Random mating Mutation | Migration
In which population is evolution by natural selection most clearly demonstrated? Group of answer choices A virus sweeps through a population and makes everyone ill. A virus sweeps through a population and kills 10% of infants. It is not clear why some die and some don't. A virus sweeps through a population and kills 20% of the population. It is not clear why some die and some don't. A virus sweeps through a population and permanently sterilizes the 10% of the population that has allele hx25c.
Why would you not want to harvest to a point where salmon populations are kept at very low numbers? Select true or false for each answer. small populations [ Choose ] are more likely to go extinct do to unforeseen (stochastic) events small populations [ Choose ] are more likely to lose genetic diversity small populations Choose ] are more susceptible to inbreeding depression small populations [ Choose ] are not growing very quickly so you would have low fishing yields
Which of the following statements is FALSE? not all individuals in a population reproduce'equally the frequency of a characteristic in a population can change between generations differential reproductive success alters a population from one generation to the next microorganisms can evolve much more quickly than most other organisms generation times are similar between species Oall of these statements are RUE