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Related Experiment Videos

Chromosome pairing in maize.

C R Burnham1, J T Stout, W H Weinheimer

  • 1Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, Minnesota 55101.

Genetics
|May 1, 1972
PubMed
Summary
This summary is machine-generated.

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This study reveals that chromosome pairing in maize does not start at centromeres but at specific sites along chromosome arms, influencing meiotic configurations. Our model explains pairing variations, offering new insights into chromosome behavior during meiosis.

Area of Science:

  • Cytogenetics
  • Molecular Biology
  • Genetics

Background:

  • Chromosome pairing is crucial for accurate meiosis and genetic recombination.
  • Previous models of chromosome pairing in maize interchanges have limitations in explaining observed configurations.

Purpose of the Study:

  • To propose and validate a new model for initial chromosome pairing in maize interchanges.
  • To understand the probability of pairing initiation at different chromosomal locations.

Main Methods:

  • Analysis of pachytene configurations in opposite-arms intercrosses of maize chromosomes 1 and 5.
  • Statistical modeling to estimate probabilities of initial and secondary pairing sites.

Main Results:

  • Initial chromosome pairing in maize does not initiate at centromeres but at specific segments along chromosome arms.

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  • The probability of initial pairing is highest in terminal segments and decreases towards the centromere.
  • Secondary pairing sites, particularly near centromeres, have low probabilities, explaining observed variations in pachytene configurations.

    • Conclusions:

    • The proposed probabilistic model accurately predicts observed pachytene configurations in maize interchanges.
    • This model offers a novel perspective on chromosome pairing, diverging from zipper-like action theories.
    • Findings align with current understanding of chromosome ultrastructure and early meiotic molecular events.