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Reproductive isolation Knowledge-Based Practice

Biology · Evolution · Biology · Speciation & Phylogeny

5 Biology practice questions on Reproductive isolation. Questions that assess core concepts and understanding.

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Questions

  1. 1.

    In two closely related species of land snails, shell spirals coil in opposite directions, preventing their genital apertures from properly aligning during attempted mating. Which reproductive barrier directly prevents gene flow between these two species?

    • A) Mechanical isolation
    • B) Habitat isolation
    • C) Gametic isolation
    • D) Temporal isolation
  2. 2.

    In broadcast-spawning marine organisms such as sea urchins, sperm and eggs from different species frequently meet in open water but fail to fuse due to molecular incompatibilities between surface recognition proteins. Which reproductive barrier is responsible for preventing hybridization in this scenario?

    • A) Gametic isolation
    • B) Mechanical isolation
    • C) Temporal isolation
    • D) Hybrid inviability
  3. 3.

    Male fireflies attract mates by emitting species-specific light-flash patterns, and females respond only to the precise rhythm and duration characteristic of their own species. Which type of reproductive isolation is demonstrated by this mating system?

    • A) Behavioral isolation
    • B) Mechanical isolation
    • C) Gametic isolation
    • D) Habitat isolation
  4. 4.

    Two closely related species of frogs inhabit the same wetland, but one reproduces in early spring while the other reproduces in mid-summer. Which type of reproductive isolation directly prevents gene flow between these two populations?

    • A) Behavioral isolation
    • B) Temporal isolation
    • C) Mechanical isolation
    • D) Gametic isolation
  5. 5.

    Which of the following is an example of a postzygotic barrier that maintains reproductive isolation between two distinct species?

    • A) Two frog species that share a pond breed during different months of the spring season.
    • B) Two bird species inhabit the same forest but use distinctly different courtship vocalizations.
    • C) Two flowering plant species possess incompatible flower shapes that restrict pollen transfer to specific pollinators.
    • D) Two equine species produce offspring that develop into robust adults but fail to produce functional gametes.

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