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Which of the following sets of evidence supports the idea that species share common ancestry?
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Similar modern species are often found living in the same areas |
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Different species share similarities at the genetic, developmental, and structural level |
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Modern populations can be observed diverging from one another, indicating the start of |
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All of the above |
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- Which of the following speciation mechanisms is most likely to be responsible for the divergence of a single species into two distinct species due to geographic isolation caused by a mountain range? Sympatric speciation Allopatric speciation (dispersal) Allopatric speciation (vicariance) Parapatric speciationWhich of the following is NOT necessary for speciation to take place? Genetic divergence Physical separation by a geographic barrier Separation in space or time Reproductive isolationIndicate the order in which the following steps would take place to result in Allopatric Speciation [enter 1 for the first step, 2 for the second, etc; write only the number -- no words, no spaces] The two groups develop reproductive isolating mechanisms so that they no longer interbreed. Interbreeding populations connected via gene flow occur across a range. The two separate groups adapt to their new environments. Some sort of physical barrier develops to split the once contiguous population(s) into two separate groups If they come back together, any hybrids formed are less fit.
- Of the following species concept, which one emphasizes reproductive isolation as the major cause for speciation? Phylogenetic species concept Morphological species concept Biological species concept Evolutionary species conceptGeographic isolation is an isolating mechanism in nature. Over long periods of time, it can lead to speciation. As the name suggests, geographic isolation is when populations of a species become separated geographically. This could also happen from the founder effect, where a small group breaks away from a larger population and establishes a group in an isolated area. Isolation could also occur when a geographic event, like an earthquake or a landslide separates a population. Once the populations are separated evolution can occur through multiple mechanisms. Natural selection could act on each population, where some individuals have favorable traits for survival. Genetic drift can occur, where genotypes become more common due to random chance. These mechanisms can lead to each subpopulation becoming so different, that they can no longer interbreed and are considered separate species. TIME ●00 • ORIGINAL GEOGRAPHIC REPRODUCTIVE SPECIATION POPULATION BARRIER ISOLATION 1. We have…Agrostis tenuis grasses tolerant of zinc metals in the soil (after evolving from metal-sensitive grasses near mine soils contaminated with zinc over the past 100 years), is an example of: allopatric speciation by vicariance allopatric speciation by dispersal peripatric speciation parapatric speciationE. sympatric speciation
- The phyletic gradualism model of speciation asserts that; Most speciation occurs allopatrically Speciation is a slow and gradual process that occurs as species slowly become geographically separated speciation occurs in quickly and then is followed by periods with little if any change Most speciation occurs sympatriallyIn comparative studies, it is important to be aware of relationships among species because a trait that appears in several closely related species is probably an adaptation it is not necessary to have large sample sizes if the species are closely related testing related species is more powerful than testing randomly chosen species experimental conclusions are statistically more powerful when data points are not independent of each other data points should be independent, and two related species might have derived their trait from a shared ancestor, rather than each having evolved it independentlyThe biological species concept primarily focuses on which of the following criteria for defining a species? Interbreeding and reproductive isolation Phylogenetic relationships Ecological roles Morphological similarities
- Which of the following statements is true regarding the phrase "adaptive radiation"? O It refers to multiple speciation events within an evolutionary lineage. It refers to many populations of the same species. It is the result of genetic drift occuring many times over evolutionary time. Gene flow is an evolutionary mechanism that can account for adaptive radiations.new species divergence Which row below identifies the model of evolution shown in this diagram and offers the best explanation of this model? The statement above is best completed by the answers in row: Row Model Explanation evolutionary history consists of long periods of equilibrium where there is little change, interrupted by periods of speciation gradualism punctuated equilibrium gradual change occurs steadily in a linear fashion; big changes (such as the evolution of a new species) occur as a result of many small changes gradual change occurs steadily in a linear fashion; big changes (such as the evolution of a new species) occur as a result of many small changes gradualism punctuated equilibrium evolutionary history consists of long periods of equilibrium where there is little change, interrupted by periods of speciation TimeHybridization was not originally recognized as a mechanism of speciation by either Darwin or the researchers of the "new synthesis". However, today there are many examples of species that have originated through hybridization. What is the best explanation for why we have so many examples of species originating through hybridization? Hybridization is more likely to occur in regions where scientists have put in more effort studying speciation Hybridization has been carried out frequently by farmers attempting to produce new, better species to grow Hybridization occurs fairly regularly, and when it leads to new species only takes a few generations, which is fast enough for researchers to see fairly easily Hybridization is fairly easy to study in captivity