Imagine two populations of fish who are part of the same species. Though they are the same species, the two populations live in slightly different habitats and have some differences in their genetic code because of this. Imagine that several fish from population A migrate to the population B and reproduce. This introduced additional genetic variation to population. This is an example of: Group of answer choices Mutation Gene flow Genetic drift Natural selection

Imagine two populations of fish who are part of the same species. Though they are the same species, the two populations live in slightly different habitats and have some differences in their genetic code because of this. Imagine that several fish from population A migrate to the population B and reproduce. This introduced additional genetic variation to population. This is an example of: Group of answer choices Mutation Gene flow Genetic drift Natural selection

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter18: Introduction To Darwinian Evolution

Section: Chapter Questions

Problem 14TYU: EVOLUTION LINK Write short paragraphs explaining each of the following statements: (a) Natural...

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A/A and A/a individuals are equally fertile. If 0.1 percent of the population is a /a, what selection pressureexists against a /a if the A → a mutation rate is 10−5 ?Assume that the frequencies of the alleles are at theirequilibrium values.
In many large mammal populations, highways can be barriers to movement - individuals rarely cross them. One solution to this problem has been to install overhead bridges for wildlife to safely cross. The goal is to increase gene flow between the populations on either side of the highway. Which of the following would you expect to see if the bridge is successful in its goal? O Higher levels of drift would occur after the bridge is installed The two populations would have different mutation rates O Both populations would decrease in size O The two populations would become more genetically similar O We would see fewer heterozygotes in both populations
Both mutation rate and population size influence genetic diversity, but they do so to different degrees. Which of the following is WRONG as a comparison of genetic diversity between two populations? O a. Cheetah population (100 individuals ) > Nycterophilia bat flies that live on them d. Forest owlet (between 70 and 400 individuals) >> Ridgway's hawk (maximum 50 individuals) e. cardinalflower (Northeast and South of North America) >> smooth azalea (only in the Eastern seaboard)
Although genetic variation is required for species to adapt tochanges in their environment, most genetic changes are detrimental. Explain why genetic mutations are rarely beneficial.
In a population of lizards, color is genetically determined. The current population has two two phenotypes: blue and yellow. Which of the following scenarios could result in evolution by migration? O A disease indiscriminately reduces the population by 90%. Birds are better able to see and therefor prey on blue lizards The population is joined by individuals from a nearby population that has an allele for a red phenotype. Females preferentially mate with individuals exhibiting the blue phenotype.
EVOLUTION LINK Write short paragraphs explaining each of the following statements: (a) Natural selection chooses from among the individuals in a population those most suited to current environmental conditions. It does not guarantee survival under future conditions. (b) Individuals do not evolve, but populations do. (c) The organisms that exist today do so because their ancestors had traits that allowed them and their offspring to thrive. (d) At the molecular level, evolution can take place by the replacement of one nucleotide by another. (e) Evolution is said to have occurred within a population when measurable genetic changes are detected.
Imagine that the volcano on Mt. St. Helens erupts again. All life is removed from the side of the mountain and has to recolonize. Your first task as a geneticist for United States Forest Service is to estimate the frequency of the red allele in the lupine plants that colonize the site. You know that the lupine seeds came from a nearby population where the frequency of the red allele has consistently been approximately 0.2 for many generations. However, in the first year (i.e. first generation, before any local reproduction) on Mt. St. Helens, the red allele of this newly colonized population has a frequency of 0.9. What is the most likely explanation for this difference in allele frequency from the nearby population?
n class we investigated the reason cystic fibrosis is maintained in the human population in higher frequency than we expected given the deleterious effects of being homozygous at the CFTR gene. We calculated the actual mutation rate of the CFTR gene to be 6.7 x 10-7. The mutation rate expected under mutation-selection balance was 4 x 10-4. What is the most plausible explanation as to why cystic fibrosis is maintained in the human population at a higher frequency than we expect? a. Negative selection against the CFTR deleterious alleles is too weak to eliminate the alleles from the human population. b. Positive selection for the CFTR deleterious alleles is likely occurring in response to some other selective pressure in the human population, possibly resistance to typhoid fever. c. The CFTR gene has an exceedingly low mutation rate causing humans to have no genetic variation at that gene. d. The CFTR gene has an exceedingly high mutation rate and that is…
You conduct an exercise in the Darwinian Snails Sim-U-Text lab. You simulate conditions under which survival of snails is selective-that is, snails with thicker shells are less likely to be preyed on by crabs than snails with thinner shells. The default settings also ensure the trait is heritable, and the population has variation in this trait. You allow mutations to occur. As you run the simulation, you observe that the mean shell thickness of the population increases over successive snail generations. Have you successfully simulated natural selection? No, because no snails appeared with thicker shells than the thickest shells observed in the initial population O Yes, because crabs preyed on the snails O No, because you cannot have selection with mutations operating No, because the changes in shell thickness could have been due to genetic drift O Yes, because there was a change in the mean shell thickness Yes, because there were mutations
Imagine a population of 80 horses in which all individuals are homozygous for an allele A1. But then a mutation introduces a new allele, A2, in one horse which is a heterozygote for this locus. Assuming the mutation is neutral, and no further mutation occurs, answer the following questions. Question 16 What is the probability that A2 will eventually become fixed? Question 17 What is the probability that A2 will go extinct?
The original source of new alleles, upon which selection operates,is mutation, a random event that occurs without regard to selectionalvalue in the organism. Although many model organismshave been used to study mutational events in populations, someinvestigators have developed abiotic molecular models. Soll et al.(2006. Genetics 175:267–275) examined one such model to studythe relationship between both deleterious and advantageousmutations and population size in a ligase molecule composed ofRNA (a ribozyme). Soll found that the smaller the population ofmolecules, the more likely it was that not only deleterious mutationsbut also advantageous mutations would disappear. Whywould population size influence the survival of both types ofmutations (deleterious and advantageous) in populations?
Gene flow often increases genetic diversity of populations that come together. Which of these is an example of when gene flow could reduce genetic diversity if two populations (Population A and Population B) come together? O The offspring with parents from population A and B have low survival because they are not adapted to the environment. O Individuals from population A have an allele that is not found in population B. O Individuals from population B have an allele that is not found in population B O Population A only has homozygous recessive alleles and population B only has homozygous dominant alleles.