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A computer simulation of the behavior of reciprocal translocations in autotetraploids.

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Aneuploidy and inbreeding depression in random mating and self-fertilizing autotetraploid populations.

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Autotetraploid gene segregation.

G G Doyle1

  • 1U.S. Department of Agriculture and Agronomy Dept., University of Missouri, Columbia, Missouri, USA.

TAG. Theoretical and Applied Genetics. Theoretische Und Angewandte Genetik
|January 16, 2014
PubMed
Summary
This summary is machine-generated.

Gene segregation in Zea mays autotetraploids was analyzed. Gamete transmission rates differed between male and female parents, impacting segregation ratios and revealing insights into chromosome number stability.

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Area of Science:

  • Genetics
  • Plant Breeding

Background:

  • Autotetraploid organisms exhibit complex inheritance patterns.
  • Understanding gene segregation in polyploids is crucial for crop improvement.

Purpose of the Study:

  • To investigate autotetraploid gene segregation in Zea mays.
  • To quantify parameters like double reduction and gamete transmission frequencies.

Main Methods:

  • Utilized a two-gene marker system (A1 and Sh2) in repulsion phase.
  • Analyzed euploid and aneuploid genotypes from testcrosses.

Main Results:

  • Gamete transmission rates (monosomic, disomic, trisomic) varied significantly between male and female parents.
  • Observed segregation ratio differences in reciprocal testcrosses were attributed to differential gamete transmission.
  • Double reduction frequency was estimated to be consistent between male and female tetrasomic tetraploids.
  • Absence of expected disomic tetraploids suggests low transmission of monosomic gametes from male parents.

Conclusions:

  • Differential gamete transmission significantly influences observed autotetraploid segregation patterns.
  • A balance between aneuploidy-inducing and aneuploid-removing forces likely maintains chromosome number stability in populations.