Campbell Biology (10th Edition)
10th Edition
ISBN: 9780321775658
Author: Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson
Publisher: PEARSON
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Textbook Question
Chapter 23, Problem 1TYU
Natural selection changes allele frequencies because some _______________ survive and reproduce better than others.
(A) alleles
(B) loci
(C) species
(D) individuals
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For this natural selection story, focus on just ONE GENETIC TRAIT that has two alleles. This is a make-believe story but the story line should sound plausible. Do not involve humans in any way.
Once upon a time there was a population of polar bears. Most of the polar bears had/were_(a)___ but a small proportion of the population had/were__(b) ___
Over many generations, the proportion of bears expressing the rare allele became more common through natural selection. What was going on within this population to cause this shift? ___(c)_(very brief is great!)
Note: do NOT mention whether the alleles are dominant/recessive nor about individuals being homozygous etc. We are looking at the big picture population-level patterns only.
Evolution is most accurately described as a change in allele frequencies in over time.
(a) an individual
(b) a species
(c) a population
(d) a community
Alternatively, selection may be performed during mating, where mating is done after a selection process of one of the sexes. The surviving individuals can pass on their (1) to the next generation. When these variations are sustained over a long time and the population changes so that it can no longer (2) with the parent population, a new species is said to have evolved.
Chapter 23 Solutions
Campbell Biology (10th Edition)
Ch. 23.1 - Explain why genetic Variation within a population...Ch. 23.1 - Ot all the mutations that occur in a population,...Ch. 23.1 - MAKE CONNECTIONS If a population stopped...Ch. 23.2 - A population has 700 individuals, 85 of genotype...Ch. 23.2 - The frequency of allele a is 0.45 for a population...Ch. 23.2 - WHAT IF? A locus that affects susceptibility to a...Ch. 23.3 - In what sense is natural selection more...Ch. 23.3 - Distinguish genetic draft from gene flow in terms...Ch. 23.3 - WH AT IF? Suppose two plant populations exchange...Ch. 23.4 - What is the relative fitness of a sterile mule?...
Ch. 23.4 - Explain why natural selection is the only...Ch. 23.4 - Prob. 3CCCh. 23 - Typically. most of the nucleotide variabillity...Ch. 23 - Is it circular reasoning to calculate p ond q from...Ch. 23 - Would two small, geographically isolated...Ch. 23 - How might secondary sex characteristics in males...Ch. 23 - Natural selection changes allele frequencies...Ch. 23 - Prob. 2TYUCh. 23 - Prob. 3TYUCh. 23 - There are 25 individuals in population 1, all with...Ch. 23 - Prob. 5TYUCh. 23 - EVOLUTION CONNECTION Using at least two examples,...Ch. 23 - Prob. 7TYUCh. 23 - Prob. 8TYUCh. 23 - SYNTHESI2E YOUR KNOWLEDGE This kettle lake forracd...
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- Applied Natural Selection: You are studying a population of a newly-discovered species of mammal called grendels. They live here in the woods of CT, and the population has a wide range of thicknesses to their fur coats. Most have a moderately thick coat year-round, including “Bob” and “Dave” and “Smurfette” and “Cindy,” four individuals that you are tracking. But a few such as “Stan” have noticeably thinner coats, and there is even one that you call “Biff” that looks almost naked and has very little body hair at all (a metrosexual grendel, if you will). On the other hand, there are also a few with thicker-than-average coats such as “Penny” and “Silvia,” and one that you have nicknamed “Cousin It” because you can’t even see his eyes through all his lustrous hair. (a) Using what you know about the different types of Selection, describe what you might expect of this population in terms of fur thickness over the next 1000 years if the climate stays the same as it has been up until…arrow_forwardAn organism’s___________ refers to the specific alleles found within its chromosomes, while the traits that these alleles produce are called its_________ . Which of these does natural selection act on?__________arrow_forwardExplain how these drawings illustrate an example of natural selection. Include the term "adaptive heritable trait" in your answer. A deer comes to eat. | A few weeks later the right-hand cactus has flowers. This figure shows the situation a few months later.arrow_forward
- One possible definition of evolution is that evolution can be seen as the change of allele frequencies with time. 1)True 2) Falsearrow_forwardThe process by which inherited characteristics of populations change over time is called_______ . Variability among individuals is the result of chance changes called_________ that occur in the hereditary molecule ________.arrow_forwardThe allele frequency in the population below has changed. Is this an example of evolution? * First generation Second generation →意意意憲 憲憲憲意 AMA 态意憲意 75% 25% 71% 29% Yes No Not enough information 介 介 介arrow_forward
- If a population’s allele and genotype frequencies remain constant from generation to generation, (a) the population is undergoing evolutionary change (b) the population is said to be at genetic equilibrium (c)microevolution has taken place (d) directional selection is occurring, but only for a few generations (e) genetic drift is a significant evolutionary forcearrow_forwardNatural selection is known to modify the population, stating that “the fittest individuals survive and reproduce, passing on their traits from generation to generation”. Give an example.arrow_forwardIndicate whether each statement presents an idea of Jean-Baptiste Lamarck, of Charles Darwin, or of Both Scientistarrow_forward
- Natural selection favored dark-colored fur in the rock pocket mouse. The selective force on the mouse population was ________. 1 - Predators 2 - Genetic mutations 3 - Rock color 4 - Availability of food for the rock pocket mice a) 1 only b) 1 and 3 c) 2 and 3 d) 1, 3 and 4arrow_forwardThere are 25 individuals in population 1, all with genotype AA,and there are 40 individuals in population 2, all with genotypeaa. Assume that these populations are located far from eachother and that their environmental conditions are very similar.Based on the information given here, the observed geneticvariation most likely resulted from(A) genetic drift.(B) gene flow.(C) nonrandom mating.(D) directional selection.arrow_forwardIn a certain population, a previously neutral, homozygous recessive gene (aa) becomes lethal through changed environmental circumstances. The frequency of the recessive allele (q) was 0.5 before the environmental changes. (i) What was the genotype distribution when the recessive genotype was not selected against / selectively neutral? (ii) What will be the allelic frequency after one generation in the altered generation? Assume random mating among the breeding population. (iii) What will be the genotype frequency of the progeny breeding population?arrow_forward
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