Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 20.5, Problem 3R
Summary Introduction
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The presence of variations at the genetic level in a population, which may elevate the chances that certain members of the population might survive unpredictable environment change, but there is no guarantee that this would be the case.
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Why is a balancedfrequency of different allelesof a gene in a population moreuseful for the survival of thatpopulation facingenvironmental changes?
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A group of 50 men and 50 women establish a colony ona remote island. After 50 generations of random mating,how frequent would a recessive trait be if it were at afrequency of 1/500 back on the mainland? The population remains the same size over the 50 generations, andthe trait has no effect on fitness.
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Life: The Science of Biology
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- In a particular population of mice, certain individualsdisplay a phenotype called short tail, which is inherited as a dominant trait. Some individuals display arecessive trait called dilute, which affects coat color.Which of these traits would be easier to eliminatefrom the population by selective breeding? Why?arrow_forwardTwo populations of snakes are separated by a river. The snakescross the river only on rare occasions. The snakes in the two populationslook very similar to each other, except that the members ofthe population on the eastern bank of the river have a yellow spoton the top of their head, whereas the members of the western populationhave an orange spot on the top of their head. Discuss twoexperimental methods that you might use to determine whether thetwo populations are members of the same species or members ofdifferent ones.arrow_forwardHow might gene flow between populations living in different habitats actually interfere with each population's adaptation to it's local environment?arrow_forward
- Why should we take caution when public discussions promoting efforts that would result in reducing modern human variation occur?arrow_forwardDiscuss criteria or measurements by whichyou might conclude that a population is betteradapted after a certain evolutionary change thanbeforearrow_forwardImagine that you are asked to manage a population of wolves that have taken upresidence on an island off the coast of Alaska. Because prey resources are limited, theisland will support only about 50 wolves at any one time. What steps would you take toprevent inbreeding and genetic drift in the population in the future?arrow_forward
- Natural selection tends to work toward genetic unity;the genotypes that are most fit produce the mostoffspring and increase the frequency of adaptive allelesin the population. Yet there remains a great deal ofvariability within the populations of species. Describethe factors that contribute to this genetic variability. Provide the link of referencesarrow_forwardIn which of the following pairs do both evolutionary processes introduce new genetic variation into a population?a. natural selection and genetic driftb. mutation and gene flowc. natural selection and gene flowd. gene flow and genetic driftarrow_forwardSuppose one population has an r that is twice as large as the r ofanother population. What is the maximum size that both populationswill reach over time, based on the exponential model?arrow_forward
- Cana a change in the physical enviroment of a population result in evolution by natural slection?(hint: remember the peppered moth's camouflage and color changes of tree bark due to pollution)arrow_forwardNatural selection operates on populations over many generations. Which of the following allows natural selection to occur? A. the desire and the advantage of a population to remain constant B. the old age of the individuals which causes them to die C. the abilty for populations to change quickly from one trait to the next D. the unequal ability of individuals to survive and reproducearrow_forwardSuppose that none of the 44 dolphins encounteredin the second sampling had been photographed before. Would you be able tosolve the equation for N? What might you conclude about population size inthis case?arrow_forward
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