Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Chapter 19, Problem 7RQ
One of the original Amish colonies rose from a ship of colonists that came from Europe. The ship s captain, who had polydactyly, a rare dominant trait, was one of the original colonists. Today, we see a much higher frequency of polydactyly in the Amish population. This is an example of:
- natural selection
- genetic drift
- founder effect
- b and c
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One possible definition of evolution is that evolution can be seen as the change of allele frequencies with time.
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Chapter 19 Solutions
Biology 2e
Ch. 19 - Figure 19.2 In plants, violet flower color (V) is...Ch. 19 - Figure 19.4 Do you think genetic drift would...Ch. 19 - Figure 19.8 In recent years, factories have become...Ch. 19 - What is the difference between micro- and...Ch. 19 - Population genetics is the study of: how selective...Ch. 19 - Which of the following populations is not in...Ch. 19 - One of the original Amish colonies rose from a...Ch. 19 - When male lions reach sexual maturity, they leave...Ch. 19 - Which of the following evolutionary forces can...Ch. 19 - What is assortative mating? when individuals mate...
Ch. 19 - When closely related individuals mate with each...Ch. 19 - What is a cline? the slope of a mountain where a...Ch. 19 - Which type of selection results in greater genetic...Ch. 19 - When males and females of a population look or act...Ch. 19 - The good genes hypothesis is a theory that...Ch. 19 - Solve for the genetic structure of a population...Ch. 19 - Explain the Hardy-Weinberg principle of...Ch. 19 - Imagine you are trying to test whether a...Ch. 19 - Describe a situation in which a population would...Ch. 19 - Describe natural selection and give an example of...Ch. 19 - Explain what a cline is and provide examples.Ch. 19 - Give an example of a trait that may have evolved...Ch. 19 - List the ways in which evolution can affect...
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- In which of the following pairs do both evolutionary processes introduce new genetic variation into a population? a. natural selection and genetic drift b. mutation and gene flow c. natural selection and gene flow d. gene flow and genetic driftarrow_forwardWhich of the following is not true of natural selection? (a) natural selection acts to preserve favorable traits and eliminate unfavorable traits (b) the offspring of individuals that are better adapted to the environment will make up a larger proportion of the next generation (c) natural selection directs the course of evolution by preserving the traits acquired during an individuals lifetime (d) natural selection acts on a populations genetic variability, which arises through mutation (e) natural selection may result in changes in allele frequencies in a populationarrow_forwardChoose an organism that is a product of artificial selection. Give a brief description of your organism and its desired traits. What wild ancestor did it come from? Was it produced with selective breeding or genetic engineering (i.e. genetically modified)? What are the benefits of artificial selection in this case? Are there potential negative consequences?arrow_forward
- A colony of woolly-winged bats inhabited an isolated cave in Canada. Some of the bats had light- brown wings, a recessive trait, and the others had dark-black wings, a dominant trait. A freak cave flood randomly killed 98% of the bats. By chance all the survivors had light-brown wings. Which of the following statements best describes the situation? The allele frequency for wing color was altered by genetic drift. O Individual with light-brown wings were favored by natural selection, which altered the allele frequency in the population; an example of directional selection. O Even if no new bats arrive in the area, genetic mixing in the surviving population will insure future generations will contain both wing color variations. O This is an example of sympatric speciation. Since the dark-black wing color is a dominant trait, it is likely to reappear in the population within a few generations, thus restoring Hardy-Weinberg equilibrium.arrow_forwardYou are tall, dark, and handsome but only average in intelligence. You want your future sons and daughters to be intelligent, so you wanted to marry a very intelligent woman. Luckily, you met a woman who is short, fair-skinned, cute, and intelligent, married her and had kids who are what you dreamed them to be. This situation shows what mechanism of evolution? * Recombination Founder effect No answer Gene Flow Random Matingarrow_forwardA scientist attempts to maintain a population of pea plants in a “non-evolving state” by trying to simulate the conditions required for Hardy-Weinberg equilibrium. He places the plants in a contained area under controlled conditions (no factors limiting) and makes certain that all crosses conducted are completely random. Which conditions for Hardy-Weinberg equilibrium have NOT been met? I. no gene flow II. no net mutations III. random mating IV. no natural selection A. I and II B. II and IV C. II only D. IV onlyarrow_forward
- Is natural selection random with respect to fitness? I know that genetic drift, gene flow and mutations are random with respect to fitness, but I wasn’t sure about natural selection. Thanks for your help.arrow_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_forwardCod live in both warm and very cold parts of the ocean. All cod have a gene for an antifreeze protein called Antifreeze glycoprotein (AFGP). Propose a potential change in the genome that would increase the cold adaptation for the cod that live in the Antarctic Ocean. Explain how natural selection and random genetic drift could act on this change. If you were to sample cod from many different environments what variation would you expect at the AFGP locus?arrow_forward
- Which 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_forwardOver the last several decades, the scientific community has gathered a large amount of information regarding genetics and genetic variation. What is a main source that leads to increased genetic variation? Top of Form Selective breeding Chromosomal mutations Recombination Genetic driftarrow_forwardAn hypothesis for the extinction of the dinosaurs is that the earth had been hit by a gigantic meteor that caused the death of those big reptiles. In that case the entire genetic pool of those animals has been destroyed, invalidating the Hardy-Weinberg equilibrium. In Genetics what is this type of gene frequency change called?arrow_forward
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