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Related Experiment Videos

Interactions between heat-induced chiasma frequency changes in Schistocerca gregaria.

S A Henderson1

  • 1Department of Genetics, University of Cambridge, U.K.

Heredity
|February 1, 1989
PubMed
Summary

Heat treatments in locusts reveal that decreases in chiasma frequency dominate over increases. The most significant heat-induced decrease proved most dominant, impacting genetic recombination.

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Area of Science:

  • Genetics
  • Entomology
  • Reproductive Biology

Background:

  • Chiasma frequency is a key indicator of genetic recombination.
  • Environmental factors, such as heat, can influence chiasma frequency.
  • Understanding these influences is crucial for evolutionary and genetic studies.

Purpose of the Study:

  • To investigate the dominance interactions between heat-induced increases and decreases in chiasma frequency.
  • To determine the effects of composite heat-treatment programs on locust chiasma frequency.
  • To identify which heat-induced effects on chiasma frequency are most dominant.

Main Methods:

  • Utilized inbred laboratory stocks of the locust Schistocerca gregaria.
  • Applied composite heat-treatment programs involving 40°C and 30°C combinations.

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  • Analyzed the resulting chiasma frequencies to assess heat-induced changes and their interactions.

    • Main Results:

    • Both heat-induced decreases in chiasma frequency (Effects 2 and 3) were found to be dominant over increases (Effects 1 and 4).
    • The most substantial heat-induced decrease (Effect 3) demonstrated dominance over all other observed effects.
    • Composite heat treatments revealed complex interactions influencing recombination rates.

    Conclusions:

    • Heat-induced decreases in chiasma frequency exert a dominant influence over increases in Schistocerca gregaria.
    • The magnitude of heat-induced decrease is a critical factor in determining dominance.
    • These findings provide insights into the environmental modulation of genetic recombination.