Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 22.1, Problem 2R
Summary Introduction
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The factors that make the reproductive isolation an essential component of each concept of the
Introduction:
Reproductive isolation is the most important factors in the divergence of the sexually reproducing lineages. It is a state where the two groups of organisms are not allowed to mate and reproduce new organisms and so, the exchange of the genes cannot take place between them anymore.
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Life: The Science of Biology
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- Why do the species included in a genus resemble in many features?arrow_forwardHow does the biological species concept differ from earlier typological concepts of a species? Why do evolutionary biologists prefer it to typological species concepts?arrow_forwardWhat notion is common to morphological, phylogenetic and biological species concepts?arrow_forward
- The biological species concept depends on the existence of barriers to reproduction. What are they? Does this species concept apply in all situations? Think of an example from nature where the biological species concept would NOT be that applicable. Which species concept would be better in this example? How does speciation occur? What environmental factors might contribute to speciation? Can an individual speciate? Use terminology for the two kinds of speciation we have learned about. What is “gene flow”? What does it mean if there is NO gene flow? Two groups of individuals are separated by either side of a canyon. One researcher found that they do not cross the canyon at any point. The group on the north side have fluffy tails and thicker coats, and they do not eat moss. The south side individuals eat moss almost exclusively, have a thin coat and tail, but otherwise are generally identical. When in the lab they mated successfully, and the offspring of that mating also mated…arrow_forwardHow do the morphological, biological, and phylogenetic speciesconcepts differ? (Please mention answer and explanation section separately. mention atleast 3-4 points of difference)arrow_forwardClosely related species are grouped together into (singular, ). By the way, what is the singular of “species”?arrow_forward
- What notion is common to morphological, phylogenetics and biological species concept?arrow_forwardSwordtails, platyfish and Poecilia species are incapable of interbreeding with each other but swordtail species 1 can produce viable hybrids with swordtail species 2. In addition, both Poecilla fish, platyfish, and swordtails can all be distinguished genetically, but swortail species 1 and 2 cannot be genetically distinguished. Using this information indicate how many distinct 1) Biological, 2) morphological, and 3) phylogenetic species would be found in this group of fish. If you cannot determine this for any of the 3 species categories, state what you would need to know in order to do so. Edit View Insert Format Tools Table 12pt v Paragraph v BIUAv er Tv: 1. There are four 2.arrow_forwardDistinguish between morphological, phylogenetic, and biological species concepts. What are the advantages and disadvantages of each? What notion is common to each of the species definitions that we considered? Why do species definitions matter in conservation biology? What are the most common mechanisms of sympatric speciation and in which major group of organisms does this happen most often? Distinguish between sympatric and allopatric and parapatric speciation. Which is considered the (far) more common mechanism of species formation? What does "gene flow" between populations do? Describe the modern theory of evolution and discuss how it is supported by evidence from two of the following three areas.a. Population geneticsb. Molecular biologyc. Comparative anatomy and embryologyEvolution is one of the major unifying concepts of modern biology. Explain the mechanisms that lead to evolutionary change. Describe how scientists use each of the following as evidence for evolution.• Bacterial…arrow_forward
- How would the phylogenetic species concept resolve the controversy over how many species exist in Ensatina eschscholtzii?arrow_forwardWhat taxonomic practices based on the typological species concept are retained in systematics today? How has their interpretation changed?arrow_forwardAt the end of the first full paragraph on p. 703, Lauder and colleagues point out that closely related species can differ for two very different reasons. What are these two causes of species differences? I'm confused about what those two reasons are as I can't find the reasons.arrow_forward
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