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Chapter 8: Problem 19

Convergent evolution can occur only when two species: a) have a recent common ancestor b) live in the same geographic area. c) are separated by a barrier such as a new river. d) evolve under similar selective forces. e) are both unpalatable to predators.

Short Answer

Expert verified
Convergent evolution occurs when species evolve under similar selective forces (option d).

Step by step solution

01

Understanding Convergent Evolution

Convergent evolution is when unrelated species develop similar traits independently, usually due to adapting to similar environmental challenges or ecological roles.
02

Analyzing the Options

Let's look at each option to determine which fits the scenario of convergent evolution: (a) Having a recent common ancestor would be more associated with divergent evolution, not convergent evolution. (b) Living in the same geographic area isn't necessary because convergent evolution can occur in different regions. (c) Being separated by barriers isn't relevant, as convergent evolution focuses on similar adaptations, not physical separation. (d) Evolving under similar selective forces is what drives the independent development of similar traits, which is characteristic of convergent evolution. (e) Being both unpalatable to predators is a shared trait that might result from convergent evolution but does not define the condition under which it occurs.
03

Choosing the Correct Answer

Given the analysis, option (d) 'evolve under similar selective forces' is the only choice that directly causes convergent evolution, as it explains why different species develop similar traits.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Selective Forces
Selective forces are environmental or ecological factors that influence the survival and reproduction of species. These forces help shape the traits seen in organisms over generations.
Factors Influencing Selective Forces
  • Predation pressure: How predators influence the prey species' traits.
  • Climate: Temperature and weather patterns affecting which traits are beneficial.
  • Competition: The struggle for resources can shape trait development.
  • Food availability: What a species can eat may lead to adaptations that optimize feeding.
In the context of convergent evolution, selective forces are responsible for driving different species to develop similar traits, even when they are not closely related.
By facing similar challenges, species "converge" on similar solutions, leading to analogous traits, like wings in bats and birds, which evolved due to similar selective pressures for flight.
Evolutionary Biology
Evolutionary biology is the scientific study of the processes that drive the diversity and adaptation of organisms on Earth. It seeks to understand how species change over time through mechanisms like mutation, migration, genetic drift, and natural selection.
Core Mechanisms
  • Natural selection: The process where individuals with favorable traits tend to reproduce more.
  • Genetic drift: Random changes in the frequency of traits in a population.
  • Migration: Movement of individuals that can introduce new genes to a population.
  • Mutation: Changes in DNA sequences that can lead to new traits.
In evolutionary biology, convergent evolution is an interesting phenomenon because it demonstrates how similar environmental challenges can shape organisms' traits similarly across unrelated lineages. It reminds us that while evolutionary paths may differ, similar outcomes can arise due to the universal forces of nature.
Trait Adaptation
Trait adaptation involves the process by which species acquire characteristics that enhance their survival and reproduction in their particular environments.
Understanding Trait Adaptation
  • Adaptations are solutions to environmental challenges, like webbed feet in aquatic animals for swimming.
  • They can be structural, behavioral, or physiological changes.
  • These changes typically emerge over many generations through natural selection.
In the context of convergent evolution, trait adaptation occurs when different species independently develop similar traits as a response to similar environmental pressures. An example of this is the development of streamline bodies in sharks and dolphins, which both aid in efficient swimming, despite their vastly different ancestries. Trait adaptation highlights the dynamic nature of evolution as species sculpt themselves to fit the environmental molds provided by nature.

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Most popular questions from this chapter

When a group of individuals colonizes a new habitat, the event is likely to be an evolutionary event, because: a) members of a small population have reduced rates of mating. b) gene flow increases. c) mutations are more common in novel environments. d) new environments tend to be inhospitable, reducing survival there. e) small founding populations are rarely genetically representative of the initial population.

Evolution: a) occurs too slowly to be observed in nature. b) can occur in the wild but not in the laboratory. c) is responsible for the increased occurrence of antibiotic-resistant bacteria. d) does not occur in human-occupied habitats. e) None of these statements is correct.

Genetic drift has the strongest effects in populations that are: a) small. b) large. c) characterized by extensive gene flow. d) in Hardy-Weinberg equilibrium. e) undergoing natural selection.

Adaptations shaped by natural selection: a) are magnified and enhanced through genetic drift. b) are unlikely to be present in humans living in industrial societies. c) may be out of date, having been shaped in the past under conditions that differed from those in the present. d) represent perfect solutions to the problems posed by nature. e) are continuously modified so that they are always matched to the environment in which a population lives.

Which of the following statements about mutations is incorrect? a) Mutations are almost always random with respect to the needs of the organism. b) A mutation is any change in an organism's DNA. c) Most mutations are harmful or neutral to the organism in which they occur. d) The origin of genetic variation is mutation. e) All of these statements are correct.
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