Questions and Answers
Which of the following are examples of prezygotic barriers? (Select all that apply)
What is temporal isolation?
A prezygotic barrier where species breed during different times of the day, seasons, or years.
What is habitat isolation?
A prezygotic barrier where two species occupy different habitats within the same area.
What is behavioral isolation?
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What is mechanical isolation?
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What is gametic isolation?
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Which of the following are examples of postzygotic barriers? (Select all that apply)
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What is reduced hybrid viability?
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What is reduced hybrid fertility?
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What is hybrid breakdown?
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Study Notes
Prezygotic Barriers
- Prezygotic barriers prevent mating or fertilization between species.
- Types of prezygotic barriers:
- Temporal isolation: Species breed at different times (day, season, year); example: skunks.
- Habitat isolation: Species live in different habitats within the same area; example: aquatic vs. terrestrial fruit flies.
- Behavioral isolation: Mating rituals affect attraction; example: blue-footed boobies' courtship behaviors.
- Mechanical isolation: Morphological differences hinder mating; example: incompatible snail shell shapes.
- Gametic isolation: Sperm of one species cannot fertilize eggs of another; example: sea urchins.
Postzygotic Barriers
- Postzygotic barriers occur after fertilization, affecting hybrid offspring.
- Types of postzygotic barriers:
- Reduced hybrid viability: Hybrids may have impaired development or survival due to gene interactions; example: salamander hybrids.
- Reduced hybrid fertility: Hybrids are sterile and cannot reproduce; example: mules (horse and donkey hybrids).
- Hybrid breakdown: First generation hybrids are viable, but subsequent generations fail to produce fertile offspring; example: some rice hybrids.
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Description
Explore the concepts of prezygotic and postzygotic barriers in reproductive biology. This quiz covers various types of prezygotic barriers such as temporal, habitat, and behavioral isolation. Test your understanding of these critical evolutionary concepts!