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 3R
Summary Introduction
To review:
The reason, due to which the biological species concept cannot be applied to asexually reproducing organisms. Also, determine whether it limits its applicability or not.
Introduction:
Ernst Mayr defined the biological species concept as the group of actual and potential interbreeding population. This population is reproductively isolated from the other groups of organisms. The word ‘actual’ refers to a situation where the individual lives in the same area and breed with each other. The word ‘potential’ refers to the situation where the organisms do not live in the same area and lead a situation, where they do not interbreed but are capable to breed.
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How many genes influence the formation of new species?
Charles Darwin’s claim, that the species level of classification is just as arbitrary as that of any other taxonomic level, is supported by all of the following observational failures except:
the inability of a sexually-reproducing eukaryotic species to interbreed with a different species
the inability of a cloning species lacking biparental reproduction to interbreed with a different species
the inability of an asexual eukaryotic species to interbreed with a different species
the inability of an extinct species (like a dinosaur) to interbreed with a different species
the inability of a prokaryotic species to interbreed with a different species.
Which reproductive barrier is most likely to prevent interbreeding between a polyploid species and
its diploid sister species?
Behavioral isolation: the two species will not recognize each other as mates
O Gametic isolation: sperm and egg with different chromosome numbers cannot complete fertilization
Hybrid infertility: differences in chromosome numbers will result in infertile hybrids
O Mechanical isolation: differences in reproductive structures will prevent interbreeding
O Temporal isolation: the two species will not reproduce at the same time of year
Chapter 22 Solutions
Life: The Science of Biology
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- How Speciation Occurs through Reproductive Isolation ?arrow_forwardCharles Darwin’s claim, that the species level of classification is just as arbitrary as that of any other taxonomic level, is supported by all of the following observational failures except: the inability of a cloning species lacking biparental reproduction to interbreed with a different species the inability of an asexual eukaryotic species to interbreed with a different species the inability of a sexually-reproducing eukaryotic species to interbreed with a different species the inability of a prokaryotic species to interbreed with a different species the inability of an extinct species (like a dinosaur) to interbreed with a different speciesarrow_forwardExplain the biological species concept. Why is it not a perfect definition of a species?arrow_forward
- How can we determine if an organism that does not reproduce sexually is a distinct species?arrow_forwardName the phenomenon by which rapid speciation takes place?arrow_forwardSympatric speciation by allotetraploidy has been proposed as acommon mechanism for speciation. Let’s suppose you were interestedin the origin of certain grass species in southern California.Experimentally, how would you go about determining if some ofthe grass species are the result of allotetraploidy?arrow_forward
- How, then, can speciation occur if gene flow exists?arrow_forwardwhich statement is false? 1)In the context of the evolution of senescence, the aphorism "live fast and die young" means that organisms with a more risky behavior will have a shorter life span. 2)Allopatric speciation is a type of speciation process that takes place in different geographic locations.arrow_forwardThe Forbes sea star and common sea star are broadcast spawners that are known to hybridize, yet they exist as separate, genetically distinct species (unique branches on the tree of life). One mechanism that may contribute to their uniqueness is prezygotic reproductive isolation, which is the incompatibility of gametes (sperm and eggs) from separate species. We know they hybridize, so the eggs and sperm are compatible, but could gametes from the different species be less compatible than the gametes from each individual species? Harper & Hart (2005) addressed this question in a series of cross-fertilization experiments. Did they find evidence that gametes ‘preferred’ to cross with gametes of the same species? Explain your answer.arrow_forward
- Species I is diploid (2 n = 8) with chromosomes AABBCCDD; related species II is diploid (2 n = 8) with chromosomes MMNNOOPP. What types of chromosome mutations do individuals with the following sets of chromosomes have? Q.AABBCCDDMNOParrow_forwardWhat is meant by “alternation of generations”?arrow_forwardCan you answer all the parts to this diagram Species 1 and 2 are sister species from which you’ve cloned related genes. On the gene tree on the top of the next page, use labels to answer the following questions: (a) Label the node that represents a gene duplication with “D,” (b) Label the nodes that represent speciation events with “S,” (c) Pick a pair of genes that are paralogs and label them both “P.” (d) Pick a pair of genes that are orthologs and label them both “O.”arrow_forward
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