Biology: The Unity and Diversity of Life (Looseleaf)
15th Edition
ISBN: 9781337408417
Author: STARR
Publisher: CENGAGE L
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Chapter 17, Problem 1SQ
Summary Introduction
Introduction: Every organism consists of genes that are made up of DNA. All organisms appear different from one another and also from their ancestors as a result of evolution. Mutation is the key for evolution and the original source for the appearance of new alleles.
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Provided with the evidences on the picture, choose which of these represents descent with modification. Why it is considered as a descent with modification? provide one theory to support your answer
One of the key ingredients of evolution by natural selection is variation. Within a population, evolution by natural selection will occur if there is a selective advantage of one variation over another. What are the sources of variation in living populations? Select all that apply.
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random mutations to DNA when DNA replicates in reproductive cells
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Chapter 17 Solutions
Biology: The Unity and Diversity of Life (Looseleaf)
Ch. 17 - Prob. 1DAACh. 17 - Prob. 2DAACh. 17 - Prob. 3DAACh. 17 - Prob. 4DAACh. 17 - Prob. 1SQCh. 17 - A neutral mutation _______ . a. has a pH of 7.0 b....Ch. 17 - Change in allele frequency of a population is...Ch. 17 - A wild population of pea plants has two alleles...Ch. 17 - Which of the following is not part of how we...Ch. 17 - Prob. 6SQ
Ch. 17 - The persistence of sickle-cell anemia in a...Ch. 17 - ___ tends to keep populations of a species similar...Ch. 17 - Which is required for a population to evolve? a....Ch. 17 - Prob. 10SQCh. 17 - After fire devastates all of the trees in a wide...Ch. 17 - True or false? Inbreeding can increase the...Ch. 17 - The difference between sympatric and parapatric...Ch. 17 - Prob. 14SQCh. 17 - Match the evolution concepts. ____ gene flow a....Ch. 17 - Species have traditionally been characterized as...Ch. 17 - Rama the cama, a llama-camel hybrid, was born in...Ch. 17 - Two species or antelope, one from Africa, the...Ch. 17 - Prob. 4CTCh. 17 - About 70 percent of flowering plants are...
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- Mutation (a) leads to adaptive evolutionary change (b) adds to the genetic variation of a population (c) is the result of genetic drift (d) almost always benefits the organism (e) a and barrow_forwardThe reason spontaneous mutations do not have an immediate effect on allele frequencies in a large population is that: a. mutations are random events, and mutations may be eitherbeneficial or harmful. b. mutations usually occur in males and have little effect oneggs. c. many mutations exert their effects after an organism hasstopped reproducing. d. mutations are so rare that mutated alleles are greatlyoutnumbered by nonmutated alleles. e. most mutations do not change the amino acid sequence of aprotein.arrow_forwardWhich of the following statements describes an example of genetic drift?a. Allele g for fat production increases in a small population because birds with more bodyfat have higher survivorship in a harsh winter.b. Random mutation increases the frequency of allele A in one population but not inanother.c. Allele R reaches a frequency of 1.0 because individuals with genotype rr are sterile.d. Allele m is lost when a virus kills all but a few individuals and just by chance, none ofthe survivors possess allele m.arrow_forward
- A. Choose which represents descent with modification, A or B? B. Explain your choice, why is it considered a descent with modification?arrow_forwardIn the universal ABO blood grouping system, there are four phenotypes—A, B, AB, and O—which are determined by three different alleles. The presence of three alleles in the ABO blood grouping system is an example of ____. a. a polymorphism b. the bottleneck effect c. genetic drift d. a dimorphism e. the founder effectarrow_forwardGenetic drift can be defined as Group of answer choices A. accidental changes in DNA structure b.how lazy loci evolve c. random change in allele frequency over time D. differences in fitness between allelesarrow_forward
- Define gene mutation Group of answer choices A. the process whereby organisms better adapted to their environment tend to survive and produce more offspring. B. the introduction of genetic material (by interbreeding) from one population of a species to another, thereby changing the composition of the gene pool of the receiving population C. variation in the relative frequency of different genotypes in a small population, owing to the chance disappearance of particular genes as individuals die or do not reproduce. D. A rare and random change in a gene that can be bad or benef icial depending on the environment .arrow_forwardNatural Selection Affects the Frequency of Genetic Disorders Will a recessive allele that is lethal in the homozygous condition ever be completely removed from a large population by natural selection?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
- 2) The year is 2050. The climate has continued to warm. Areas in northern Canada and Alaska are without snow or ice; the average annual temperature has risen and previously snow-covered areas are now shrub land and some temperate forests. What effect would such a climatic change have on the gene pool of the rabbits? All BUT ONE could apply. In northern Canada, a population of rabbits was predominantly white in color. The allele for white color is recessive (g) while the allele for gray color is dominant (G). Over the last several decades, the average annual temperature of this area has increased and the long-term deposits of ice and snow have become scarce. In this case, the frequency of a previously rare allele becomes more frequent in the population. Choose one.A) The allelic frequency has most likely shifted to 85% GG and 15% gg. B) The dominant allele in the gene pool would become G, the previously rare allele. C) The allele for white, g, would be scarce and perhaps nonexistent…arrow_forwardA/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.arrow_forwardA geneticist is interested in whether asthma is caused by a mutation in the DS112 gene.The geneticist collects DNA from 120 people with asthma and 100 healthy people, andshe sequences the DNA. She finds that 35 of the people with asthma and none of thehealthy people have a mutation in the DS112 gene. What is the population in this study?a. The 120 people with asthmab. The 100 healthy peoplec. The 35 people with a mutation in the DS112 gened. All people with asthmaarrow_forward
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