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Related Experiment Videos

"Alternate-2" disjunction does not exist.

I A Boussy1

  • 1Department of Genetics University of California Davis, California 95616.

Genetics
|March 1, 1982
PubMed
Summary
This summary is machine-generated.

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The classic model of translocation heterozygote disjunction has been re-examined. Researchers found only one type of alternate disjunction configuration exists, contrary to previous claims of two distinct types.

Area of Science:

  • Genetics
  • Cytology
  • Molecular Biology

Background:

  • John and Lewis (1965) proposed a model differentiating two types of alternate disjunction (alternate-1 and alternate-2) in translocation heterozygotes.
  • Subsequent studies claimed to observe these two distinct configurations during meiosis in various species.

Purpose of the Study:

  • To re-evaluate the proposed model of disjunction in translocation heterozygotes.
  • To clarify the number of distinct alternate disjunction configurations.

Main Methods:

  • Analysis of meiotic preparations.
  • Topological interpretation of three-dimensional disjunction phenomena.

Main Results:

  • Observations interpreted as two distinct alternate disjunction types are based on a flawed two-dimensional analysis.

Related Experiment Videos

  • The two claimed configurations are topologically identical.
  • There is only one possible alternate disjunction configuration.

    • Conclusions:

    • The distinction between alternate-1 and alternate-2 disjunction types is not supported by topological analysis.
    • Previous claims of observing two distinct alternate disjunction configurations are erroneous.
    • A single type of alternate disjunction configuration is proposed for translocation heterozygotes.