Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 22.4, Problem 1SB
Summary Introduction
To review:
Natural selection can promote reproductive isolation in allopatric populations.
Introduction:
Natural selection plays an important role in the process of evolution. Only the organisms that are selected by nature survive and the rest are eliminated. The selected organisms reproduce and the genes of the selected organisms contribute largely to the genetic pool of that population. Their genotype becomes more common in the population.
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What specific reproductive isolation mechanism is being described by each following statements
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Decide whether each of the following scenarios would lead to prezygotic or postzygotic reproductive
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a) Dragonflies from two different populations have genitals that do not match, so they can't mate
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b) Two different species of fish have very different courtship displays, but they can mate and produce a
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c) One species of plant flowers in the winter, while another flowers in early spring
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d) The gametes of two tree species can fuse, but a zygote does not form
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e) A mountain range separates two populations of snakes
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Chapter 22 Solutions
Biology: The Dynamic Science (MindTap Course List)
Ch. 22.1 - How do the morphological, biological, and...Ch. 22.1 - What is clinical variation?Ch. 22.2 - What is the difference between prezygotic and...Ch. 22.2 - Prob. 2SBCh. 22.3 - Prob. 1SBCh. 22.3 - Why might insects from different host races be...Ch. 22.4 - Prob. 1SBCh. 22.4 - Prob. 2SBCh. 22 - The biological species concept defines species on...Ch. 22 - Prob. 2TYK
Ch. 22 - A characteristic that exhibits smooth changes in...Ch. 22 - Prezygotic is isolating mechanisms: a. reduce the...Ch. 22 - In the model of allopatric speciation, the...Ch. 22 - Prob. 6TYKCh. 22 - If two species of holly (genus Ilex) flower during...Ch. 22 - Prob. 8TYKCh. 22 - An animal breeder, attempting to cross a llama...Ch. 22 - Prob. 10TYKCh. 22 - Apply Evolutionary Thinking How do human...Ch. 22 - Prob. 12TYKCh. 22 - Prob. 13TYKCh. 22 - Prob. 14TYKCh. 22 - Prob. 15TYKCh. 22 - David Hills of Baylor University noted that three...
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- What is the one species that has shown the clearest examples of Group Selection?arrow_forwardEven though Hardy and Weinburg showed that the process of random reproduction will not alter gene frequency in a population over time, in wild populations we observe that gene frequencies do change overtime so what has happened? A) sexual selection B) Evolution due to sexual selection C) none of these D) any of these E) Evolution due to genetic driftarrow_forwardIn what way is diversity intrinsically valuable to a population? How is genotypic or phenotypic diversity maintained if natural selection reduces variation?arrow_forward
- 27) In the fruit fly speciation experiment, individuals from separate populations that were raised using the same food source were more likely to attempt mating with each other than individuals raised on different food sources. Why? A) Because they had adapted to their environment in the same way B) Because this is an example of allopatric speciation C) Because the separate populations were able to carry out some gene flow D)Because the jars were accidently placed next to each other so the males and females were able to recognize each 28) What is needed for natural selection to occur? A) Variation sexual reproduction, competition B) Variation, heritability competition C)Variation, competition, time D) Heritability, competition, sexual reproductionarrow_forwardIf (positive) assortative mating increases in a population, what would expect to happen to genotype frequency over generations? O a) Frequency of the heterozygous genotype will increase. b) Frequency of the homozygous genotypes will decrease. O c) Frequency of the homozygous genotypes will increase. O d) There will be no change in genotype frequency.arrow_forwardwhy are reproductive barriers essential in speciation?arrow_forward
- Over time, enough genetic variations can develop within a population to cause it to undergo speciation. Identify the various mechanisms that will prevent different species from being able to reproduce successfully. Which of these mechanisms is the most influential in keeping species sperate?arrow_forwardHow can natural selection maintain harmful alleles in a population?arrow_forwardHow is the optimal reproductive strategy of a species produced over time by Natural Selection (assume that there is some phenotypic and genetic variance for reproductive strategies in a population)arrow_forward
- 1) Many organisms have the ability to reproduce asexually as well as perform sexual reproduction. A Scientist, John Smith, was conducting research on aphids that can undergo both methods of reproduction. He determined the males in his population had fertilization rate of 1.8 and a relative fitness of outcrossed offspring was 1.1. a) What is the equilibrium frequency of males in this population? b) Is this population stable equilibrium and why?arrow_forwardHow, then, can speciation occur if gene flow exists?arrow_forwardExplain how sexual selection might lead to a)sexual dimorphism and b) members of one sex (usually male) having traits that do not enhance their survivalarrow_forward
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