Biology: Science for Life with Physiology (6th Edition) (Belk, Border & Maier, The Biology: Science for Life Series, 5th Edition)
6th Edition
ISBN: 9780134555430
Author: Colleen Belk, Virginia Borden Maier
Publisher: PEARSON
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Chapter 12, Problem 6LTB
Summary Introduction
Introduction:
Evolution may occur through several mechanisms like genetic drift, mutation and migration. In natural selection, the fittest organism is selected naturally. Natural selection is the key mechanism of evolution, which is the change in inherited traits or characteristics of a population over generations.
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A fungus goes through a population of worms killing most of them. It appears that this fungus kills any worm that becomes infected. No worms have any genetic advantages.
A small group of worms survives by sheer luck. And by coincidence (i.e. not related to the fungus) these worms all have a rare allele for blue skin. The blue color seems to have no affect in their survival nor reproduction.
The survivors reproduced and the population gets back to its normal number. But most worms now have the blue skin allele. The increase in this allele was due to:
Group of answer choices
natural selection
non-random mating
genetic drift
12
The phenotype and genotype of a population is due to a mosaic of random and directed processes. Some have to do with history. Some are related to adaption.
A fungus goes through a population of worms killing most of them. It appears that this fungus kills any worm that becomes infected. No worms have any genetic advantages.
A small group of worms survives by sheer luck. And by coincidence (i.e. not related to the fungus) these worms all have a rare allele for blue skin. The blue color seems to have no affect in their survival nor reproduction.
The survivors reproduced and the population gets back to its normal number. But most worms now have the blue skin allele. The increase in this allele was due to:
Group of answer choices
natural selection
non-random mating
genetic drift
macroevolution
12
Chapter 12 Solutions
Biology: Science for Life with Physiology (6th Edition) (Belk, Border & Maier, The Biology: Science for Life Series, 5th Edition)
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- The magnification of genetic drift as a result of natural events or catastrophes is _____; _____ is the flow of alleles in and out of a population due to the migration of individuals or gametes.arrow_forward(Following Question 25) If a mutation occurred such that A2 allele appeared in this population. The new allele has the effect of reproducing one year earlier but at the cost of not being able to reproduce after age 6. Can A2 allele be selected for and subsequently fixed in the population? Yes, because A2 allele exhibits the antagonistic pleiotropic effect. Yes, because carriers of the A2 allele have a higher expected lifetime reproductive success than the individuals carrying the A1 allele. No, because carriers of the A2 allele live fast, therefore they will always die young. No, because the carriers of the A2 allele have a lower expected lifetime reproductive success. Therefore, the A2 allele is a deleterious allele. Not enough information in this problem that would allow us to make an informed prediction.arrow_forwardNatural selection results in the adaptation of organisms to the circumstances of their way of life and their environment True or Falsearrow_forward
- A difference in survival and reproduction among members of a population that vary in one or more traits is called ________.arrow_forwarda statement of how sexual selection differs from natural selection has to be a statement that is wrrtien in a essayarrow_forwardA change in structure, behavior, or physiology that enhances survival, and reproductive success in a particular environment is called _________. Genetic drift Mimcry Adaptation Gene flowarrow_forward
- BASED ON THIS GRAPH: A small community that is heavily infested with mosquitoes was sprayed weekly with the insecticide DDT for several months. Daily counts providing information on mosquito population size are represented in the graph below. Provide a biological explanation for the changes in the mosquito population over time. Use the terms: insecticide resistance/resistant, natural selection, favorable trait, reproduce, mutation/sexual reproductionarrow_forwardGene frequency is the percentage of a population that carries a particular allele located in a locus. True Falsearrow_forwardWhat force, which changes gene frequencies, occurs if there is a failure to reproduce or if individuals become isolated from the rest of their population? mutation radiation genetic drift nonrandom matingarrow_forward
- A small community that is heavily infested with mosquitoes was sprayed weekly with the insecticide DDT for several months. Daily counts providing information on mosquito population size are represented in the graph below. Provide a biological explanation for the changes in the mosquito population over time. Use the terms: insecticide resistance/resistant, natural selection, favorable trait, reproduce, mutation/sexual reproduction Use this sentence starter: At the beginning the daily mosquito count (increased/decreased) until month _, then it started to (increase/decrease). This occurred because.. Use NUMBERS FROM THE GRAPHarrow_forwardUse the following information to answer the next question. Penicillin kills bacteria by obstructing the bacteria's ability to synthesize a cell wall. However, certain bacteria have developed resistance against penicillin. Staphylococcus bacteria produce an enzyme called penicillinase. This enzyme helps breakdown penicillin. Which of the following processes results in the development of penicillin-resistant Staphylococcus bacteria? O natural selection artificial selection O artificial insemination O inbreedingarrow_forward« > A Moving to another question will save this response. Charles Darwin was the first person to propose: That the earth is older than a few thousand years. O A mechanism for how evolution occurs. A mechanism for evolution that was supported by evidence A way to use artificial selection as means for domesticating animals and plants.arrow_forward
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