Speciation and Reproductive Isolation (B6)
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Questions and Answers

What defines a biological species?

  • Any collection of organisms that share similar traits.
  • A group that can survive in diverse habitats.
  • A group of organisms that can adapt to environmental changes.
  • Populations that can breed and produce viable offspring. (correct)
  • What is the primary difference between transformation and divergence in speciation?

  • Transformation occurs slowly over time, while divergence happens quickly.
  • Transformation replaces the original species, while divergence creates one or more species from a parent species. (correct)
  • Transformation involves reproduction, while divergence does not.
  • Transformation leads to geographical isolation, while divergence occurs due to biological barriers.
  • Which factor is essential for geographical barriers to lead to speciation?

  • They need to be permanent and unchanging.
  • They must occur among species with similar reproductive cycles.
  • They must restrict food and resource availability.
  • They only need to be present long enough for speciation to occur. (correct)
  • Which of the following is an example of reproductive isolation due to biological barriers?

    <p>Frogs that breed in spring while other frogs breed in fall.</p> Signup and view all the answers

    What is adaptive radiation?

    <p>The diversification of a common ancestral species into various adapted species.</p> Signup and view all the answers

    How can populations become reproductively isolated within the range of a parent population?

    <p>By using resources that are not utilized by their parents.</p> Signup and view all the answers

    What does gradualism imply in evolutionary theory?

    <p>Evolutions happen slowly and gradually over time.</p> Signup and view all the answers

    Which of these represents an example of a geographical barrier?

    <p>A mountain range separating two animal populations.</p> Signup and view all the answers

    Study Notes

    How Species Form

    • Biological species are groups that can breed and produce fertile offspring in nature.
    • Reproductive isolation prevents dissimilar species from mating.
    • Populations breeding at different times are also reproductively isolated.

    Forming New Species

    • Speciation is the process of creating a new species.
    • Transformation is the replacement of an original species with an altered one.
    • Divergence is the creation of new species from a single parent species, resulting in increased biodiversity.

    Isolation of Populations

    • Geographical barriers, such as bodies of water, physically separate populations, leading to reproductive isolation.
    • Biological barriers include differences in niches and breeding times, even within the same range.

    Speciation in Reproductively Isolated Populations

    • When populations become reproductively isolated, speciation has occurred.
    • Isolation can occur within a parent population's geographical range if offspring use different resources than their parents.

    Adaptive Radiation

    • Adaptive radiation describes the diversification of a common ancestor into various adapted species.
    • Darwin's finches are an example of adaptive radiation.

    Why Adaptive Radiation Occurs

    • The process of natural selection favors adaptations that exploit specific resources within an environment.
    • The diversity of resources leads to a diversity of traits within a population.
    • Over time, this diversification can lead to new species forming.

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    B6 - How Species Form PDF

    Description

    This quiz explores the concepts of how new species form through reproductive isolation and the processes involved in speciation. Understand the roles of geographical and biological barriers in the species formation process. Test your knowledge on the mechanisms that contribute to biodiversity!

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