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Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.
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Related Experiment Video

Updated: Jul 6, 2025

Non-radioactive in situ Hybridization Protocol Applicable for Norway Spruce and a Range of Plant Species
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Distinct ancient structural polymorphisms control heterodichogamy in walnuts and hickories.

Jeffrey S Groh1,2, Diane C Vik1, Kristian A Stevens1,3

  • 1Department of Evolution and Ecology, University of California, Davis.

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|January 8, 2024
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Summary

This study investigates heterodichogamy, a mating system in walnuts and pecans, revealing two ancient genetic mechanisms controlling this floral trait. These findings shed light on the evolution of plant mating systems and balancing selection.

Keywords:
CaryaJuglandaceaeJuglansT6Pbalanced polymorphismflowering timeheterodichogamypecanstructural variationsupergenetrans-species polymorphismtrehalose phosphate phosphatasewalnut

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Area of Science:

  • * Evolutionary Biology
  • * Plant Genetics
  • * Molecular Ecology

Background:

  • * Heterodichogamy is a balanced mating polymorphism in angiosperms, common in Juglandaceae (walnuts and pecans).
  • * This system, crucial for maintaining species' reproductive success, is controlled by a single dominant allele in both *Juglans* and *Carya* genera.
  • * Understanding the genetic underpinnings of heterodichogamy provides insights into balancing selection and the evolution of plant mating systems.

Conclusions:

  • * Heterodichogamy in Juglandaceae is controlled by ancient, distinct genetic mechanisms involving structural variants and gene clusters.
  • * These findings highlight the role of balancing selection in shaping complex mating systems through different evolutionary pathways.
  • * The study suggests that additional genetic systems for heterodichogamy may exist in other genera.