Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
A severe fire or flood kills 90% of a population of squirrels in a forest. The remaining squirrels evolve into a population quite distinct from the original. In another forest, a bacterial infection kills 90% of the squirrels in the forest, and the remaining squirrels also evolve into a distinct population. The first instance is considered genetic drift, and the second is natural selection. Explain the difference.
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution
Trending nowThis is a popular solution!
Step by stepSolved in 2 steps
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- If both the forces of mutation and natural selection are acting on this population from generation to generation (and have been acting on this population for many many generations), what do you predict will happen to allele frequencies over successive generations? Allele frequencies will remain constant The frequency of the D allele will increase The frequency of the d allele will increasearrow_forwardBelow is a histogram showing the results from a previous class’s dataset. Some trials resulted (ended) with the white allele fixing (reaching 100%), some resulted with the white allele going extinct (0%), and some fell somewhere in between. What phenomenon most likely drove this pattern? Answer choices are : random mating, genetic drift, mutation, natural selection, or gener flowarrow_forwardIn 1959 Daniel Yuh set up a long-term study of cataloging the blood types of a group of foragers in the Brazilian rainforest. In 1959 he found there were no individuals with blood type B. Three generations later, after this group had begun exchanging mating partners with another group, there were several members with blood type B. A-mutation B-natural selection C-gene flow D-genetic driftarrow_forward
- Several generations of population X have been studied. The dominant allele frequency for the second generation of population X was calculated to be 0.27. The tenth generation for population X has been collected and the dominant allele frequency is 0.73. Is population X evolving? Explain your answer(s).arrow_forwardTwo types of genetic drift effects are: the founder effect, in which a few members of a larger population leave to form a new population, and population bottlenecks, where only a few members of a population survive an event. Categorize the examples below as to whether a founder effect or a population bottleneck is more likely. (Four examples describe each of the two types of genetic drift) The human population of Easter Island exhibits a limited gene pool. The Wollemi pine of Australia was thought to be extinct until it was discovered growing in a secluded canyon. The Afrikaner population in South Africa descended from a small number of Dutch colonists and now has a high rate of Huntington disease. A mass extinction event 12,000 years ago eliminated about 75% of cheetahs. Cheetahs are now genetically similar Semi-domesticated reindeer were introduced into Iceland in 1787 from Norway. The Toba supereruption ~73,000 years ago may have reduced the human population of Earth to 3,000-…arrow_forwardIn a population of mayflies, variation in the STRIPE gene causes different body coloration. SS individuals have skinny stripes, Ss individuals have wide stripes, and ss individuals are unassigned. You collect some mayflies and estimate that the frequency of the S allele is 0.85. You want to know whether the population is evolving, so you will return to the same site next summer and collect 1000 mayflies from the next generation. If the population is not evolving, how many of the 1000 mayflies collected next summer should have wide stripes. (round to the nearest whole number) A. 255 b.850 C. 723 D. 23arrow_forward
- Purpose: to simulate genetic drift and gene flow as a mechanisms for the evolution of a population Materials: skittles or m&ms (you may also use other colorful small items with at least 5 colors and a lot of pieces) and a paper towel or towel Directions: ● ● ● grab a bag of skittles or m&ms - this is your ORIGINAL POPULATION of the candy organism carefully and without looking remove a small handful and place them on the towel - this is your genetic drift population ● record all info for the genetic drift population - how many of each color found in the original population do you have (if you have 0 oranges and purples write out 0 for those colors) and what the percentage is for that population (if you have 3 reds out of 6, red is 50% of the population) after you have recorded all the genetic drift population you will add that population BACK to the original bag and record all info (color and % of the population) for the original population You may want to use a chart like this: color…arrow_forwardAntibiotics are commonly used to combat bacterial and fungal infections. During the past several decades, however, antibioticresistant strains of microorganisms have become alarmingly prevalent. This has undermined the effectiveness of antibiotics in treating many types of infectious disease. Discuss how the following processes that alter allele frequencies may have contributed to the emergence of antibiotic-resistant strains: A. Random mutation B. Genetic drift C. Natural selectionarrow_forwardThe following table provides phenotypic data for a population of mammoths living in cold environments based on fossil and DNA evidence. Based on this data and your knowledge of natural selection, which explanation best explains the trends seen in the data? Individuals with thicker fur had a survival advantage in the cold environment, allowing these individuals to reproduce more often and create more offspring. Individuals within this population of mammoths tend to only mate with individuals that have thick fur. This population of mammoths appear to be in Hardy-Weinberg equilibrium since no allele frequencies are changing over time. Individuals with thick fur migrated into the population of mammoths, increasing the proportion of these individuals.arrow_forward
- Can you explain which answer is accurate and why it's the correct choice?arrow_forwardWhich of the following is an example of genetic drift? Group of answer choices A-As global temperatures increase, alleles that confer resistance to heat become more prevalent B-Peter Parker gets irradiated and turns into Spider Man C-The American Bison was hunted almost to extinction very quickly, and only a few remained D-5% of your neighborhood moves to Canadarrow_forwardWhich of the following statements most accurately describes the effects of genetic drift on a population? a. Populations of the same size will follow the same evolutionary trajectory when evolving due to drift. b. Genetic drift has the potential to drive evolution in all populations. c. Allele frequencies in a population of infinite size will ultimately drift to fixation or loss. d. The loss of otters in California due to excessive hunting cause a founder effect.arrow_forward
arrow_back_ios
arrow_forward_ios
Recommended textbooks for you
- Human Anatomy & Physiology (11th Edition)BiologyISBN:9780134580999Author:Elaine N. Marieb, Katja N. HoehnPublisher:PEARSONBiology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStaxAnatomy & PhysiologyBiologyISBN:9781259398629Author:McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa StouterPublisher:Mcgraw Hill Education,
- Molecular Biology of the Cell (Sixth Edition)BiologyISBN:9780815344322Author:Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter WalterPublisher:W. W. Norton & CompanyLaboratory Manual For Human Anatomy & PhysiologyBiologyISBN:9781260159363Author:Martin, Terry R., Prentice-craver, CynthiaPublisher:McGraw-Hill Publishing Co.Inquiry Into Life (16th Edition)BiologyISBN:9781260231700Author:Sylvia S. Mader, Michael WindelspechtPublisher:McGraw Hill Education
Human Anatomy & Physiology (11th Edition)
Biology
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:PEARSON
Biology 2e
Biology
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:OpenStax
Anatomy & Physiology
Biology
ISBN:9781259398629
Author:McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa Stouter
Publisher:Mcgraw Hill Education,
Molecular Biology of the Cell (Sixth Edition)
Biology
ISBN:9780815344322
Author:Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter Walter
Publisher:W. W. Norton & Company
Laboratory Manual For Human Anatomy & Physiology
Biology
ISBN:9781260159363
Author:Martin, Terry R., Prentice-craver, Cynthia
Publisher:McGraw-Hill Publishing Co.
Inquiry Into Life (16th Edition)
Biology
ISBN:9781260231700
Author:Sylvia S. Mader, Michael Windelspecht
Publisher:McGraw Hill Education