Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 20, Problem 6TY
Summary Introduction
Introduction:
Hawaiian Islands show allopatric
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Over many generations, there is a good chance that an advantageous gene will be shared by every organism of the same species or that a new species will emerge. These long-term outcomes are called:
population
evolution
hybridization
adaptation
Which part of these statements isn't right ?
A species is a group of organisms that can potentially interbreed with one another to produce viable, fertile offspring. Speciation is when two new species form from one original one. Sympatric speciation occurs when there is a geographic separation of a population. Allopatric speciation occurs while the population remains in the same area. Adaptive radiation occurs when one species evolves into many to fill several different niches.
Natural selection requires traits to be passed from parent to offspring, more offspring are produced than can survive creating competition, and inherited traits vary among offspring.
Fossils, Anatomy and embryology, biogeography, and molecular biology all provide support for the theory of evolution.
Evolution can be driven by many different things. Mutations are changes in DNA that create new alleles in a population. Gene flow is the flow of alleles in and out of a population resulting from the migration…
Choose which evolutionary mechanism is most likely to cause speciation events. founder effect gene flow mutation natural selection non-random mating
Chapter 20 Solutions
Principles of Biology
Ch. 20.1 - Prob. 1CCCh. 20.1 - Prob. 1TYKCh. 20.1 - Prob. 2TYKCh. 20.2 - Prob. 1BCCh. 20.2 - Is this an example of a prezygotic or a...Ch. 20.2 - Is this an example of a prezygotic or a...Ch. 20.2 - Prob. 1TYKCh. 20.2 - Which of the following is not an example of a...Ch. 20.3 - Prob. 1BCCh. 20.3 - Prob. 1CC
Ch. 20.3 - Which of the following is an example of allopatric...Ch. 20.3 - Prob. 2TYKCh. 20.4 - Prob. 1CCCh. 20.4 - Prob. 2CCCh. 20.4 - Prob. 1TYKCh. 20 - Macroevolution refers to evolutionary changes that...Ch. 20 - Prob. 2TYCh. 20 - Prob. 3TYCh. 20 - Prob. 4TYCh. 20 - Prob. 5TYCh. 20 - Prob. 6TYCh. 20 - Prob. 7TYCh. 20 - Prob. 8TYCh. 20 - Prob. 9TYCh. 20 - Evolutionary changes in the rate or timing of...Ch. 20 - Prob. 1CCQCh. 20 - Compare and contrast different mechanisms of...Ch. 20 - A principle of biology is that populations of...Ch. 20 - Prob. 1CBQCh. 20 - Discuss the type of speciation (allopatric or...
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- A group of individuals that can interbreed in nature and produce viable offspring would be considered to be a species according to the Ophylogenetic species concept. Obiological species concept. evolutionary species concept. Oecological species concept. general lineage concept.arrow_forwardOrganisms with the most beneficial traits will survive. This is commonly known as O ecosystems. survival of the fittest. variations. theory of evolution.arrow_forwardIn sympatric speciation (fill in the blank) can result in (fill in the blank) and lead to formation of new species from a population that (fill in the blank) fill in the blank with the following: is geographically isolated, gene flow, reproduction isolation, is in the same environment, genetic drift, or ecological isolationarrow_forward
- The evolution of one species into two or more species as a result of different populations becoming reproductively isolated from each other is best termed as adaptive radiation. True or False.arrow_forwardUnder which of the following conditions is a population most likely to evolve? phenotypic variation random mating no gene flow a large population genetic drift What does hybrid sterility refer to? temporal isolation mechanical isolation allopatric speciation a prezygotic isolating mechanism none of the abovearrow_forwardWhich of the following forces of evolution tends to slow down population divergence and prevent speciation? Group of answer choices Sexual selection Genetic drift Gene flow Mutation Natural selectionarrow_forward
- What is the process in which two closely interacting species jointly act as selective agents of traits for each other? Coevolution Adaptive radiation Microevolution Macroevolutionarrow_forwardSpeciation events can occur on a variety of timescales. Which factor is NOT likely to influence the rate of speciation? Selection pressures Color of the organism Generation time Mutation ratearrow_forwardWhich 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 speciationarrow_forward
- Which of the following statements about sympatric speciation is correct? It is a process through which two populations can diverge and develop reproductive isolation while in two different geographic area. It is the most common mechanism for populations to form independent species. Postzygotic isolation is the main form of reproductive isolation for the sympatric speciation process. Genetic isolation through large scale chromosomal mutations, such as chromosome inversion or polyploidy, are more likely contributing to sympatric speciation. None of the abovearrow_forwardA new species seems to be forming in areas where there is geographic separation between the divergent populations. If true, this would represent an example of: Peripatric speciation Genetic drift Sympatric speciation Adaptive radiation Allopatric speciationarrow_forwardAssume you are studying secondary contact in two species of birds. You notice that hybrids are produced and that much of the DNA of each species is becoming more similar over time. The likely end point of this process is which of the following? Fusion Evolution of reproductive isolation Reinforcement Stable and minimal hybrid productionarrow_forward
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