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Updated: Jun 13, 2026

Paradigms for Behavioral Assessment in Drosophila Model of Autism Spectrum Disorder
08:30

Paradigms for Behavioral Assessment in Drosophila Model of Autism Spectrum Disorder

Published on: September 6, 2024

Positively negative evidence for asexuality.

C William Birky1

  • 1Department of Ecology and Evolutionary Biology, Biological Sciences West, The University of Arizona, Tucson, AZ 85721, USA. birky@u.arizona.edu

The Journal of Heredity
|April 28, 2010
PubMed
Summary

Statistical analysis of large samples provides strong evidence for obligatory asexuality in bdelloid rotifers and darwinulid ostracods. The absence of sexual reproduction in these ancient asexual lineages is statistically significant, refuting skepticism.

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Area of Science:

  • Evolutionary Biology
  • Genetics
  • Reproductive Biology

Background:

  • Many eukaryotes lack detected sexual reproduction, leading to skepticism about obligatory asexuality.
  • Skepticism arises from the long-term disadvantages of asexuality and the possibility of undetected sexual individuals.

Purpose of the Study:

  • To statistically evaluate evidence for obligatory asexuality in eukaryotes.
  • To address skepticism regarding the existence of ancient asexual lineages.

Main Methods:

  • Statistical analysis using the Poisson distribution.
  • Examination of large-scale survey data on bdelloid rotifers and darwinulid ostracods.

Main Results:

  • In bdelloid rotifers, the upper 95% confidence interval for sexual individuals is < 8.1 x 10(-6).
  • In darwinulid ostracods, the estimate for sexual individuals is < 1.75 x 10(-4).
  • These low frequencies suggest sexual reproduction would be ineffective and easily lost.

Conclusions:

  • Statistical absence of sexual individuals in large samples provides convincing evidence for obligatory asexuality.
  • Ancient asexual lineages are likely the oldest surviving asexual lineages, not "scandalous" exceptions.