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Interlude A
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Interlude B
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Interlude E

Fragmentation of Tropical Forests Can Create "Genetic Bottleneck"

A new study by botanists at the University of Georgia shows for the first time that trees left standing in tropical pastures can actually dominate the reproduction in nearby remnant forests, creating a "genetic bottleneck."

» Read the full article

Active Reading Questions

  1. A genetic bottleneck results when
    a) a species has insufficient numbers to maintain genetic variability.
    b) harmful alleles are fixed in a species because many members express the harmful alleles.
    c) genetic drift and inbreeding have caused a loss of genetic variability in a species.
    d) all of the above
  2. The movement of alleles from one patch of a forest to another patch of forest is best described as
    a) gene flow.
    b) founder effect.
    c) natural Selection.
    d) fixation.
  3. Explain how increased reproduction of a few “remnant trees,” as described in the article, can cause a decrease in genetic diversity.
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