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Incomplete Dominance01:43

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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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Field Experiments of Pollination Ecology: The Case of Lycoris sanguinea var. sanguinea
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FREQUENCY-DEPENDENT VARIATION FOR OUTCROSSING RATE AMONG FLOWER-COLOR MORPHS OF IPOMOEA PURPUREA.

Bryan K Epperson1, Michael T Clegg1

  • 1Department of Botany and Plant Sciences, University of California, Riverside, CA, 92521.

Evolution; International Journal of Organic Evolution
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Summary
This summary is machine-generated.

Rare white morning glory flowers get fewer bee visits, lowering their outcrossing rate. This frequency-dependent pollination may help maintain flower color variation in plant populations.

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Area of Science:

  • Plant evolutionary biology
  • Ecology
  • Population genetics

Background:

  • Common morning glory (Ipomoea purpurea) populations exhibit flower-color polymorphism.
  • Flower color influences pollinator visitation and outcrossing rates.
  • Previous studies indicate pollinator bias based on flower color.

Purpose of the Study:

  • To investigate the frequency-dependent outcrossing rates of white flower morphs in Ipomoea purpurea.
  • To determine if rare morphs experience altered pollinator service and outcrossing success.
  • To explore the role of pollinator-mediated selection in maintaining genetic variation for flower color.

Main Methods:

  • Experimental manipulation of morph frequencies in common morning glory populations.
  • Monitoring pollinator (bumblebee) visitation rates to different flower morphs.
  • Quantifying outcrossing rates for white and colored flower morphs at varying frequencies.

Main Results:

  • White flower morphs had significantly lower outcrossing rates when rare and visited less by bumblebees.
  • Colored morphs (blue, pink) did not show reduced outcrossing rates when rare.
  • Pollinator visitation and subsequent outcrossing were frequency-dependent for the white morph.

Conclusions:

  • Undervisitation of rare morphs can stabilize genetic variation for flower color in plant populations.
  • Frequency-dependent selection mediated by pollinators plays a role in maintaining polymorphism.
  • This mechanism contributes to the evolutionary persistence of diverse floral traits.