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One million years without sex fails to erase stick insects' unused biological system

Phys · 🇺🇸 public United States · · 382 words · By Bangor University
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What to know about One million years without sex fails to erase stick insects' unused biological system

Researchers led by Dr. Darren Parker studied Timema stick insects that have reproduced asexually for one million years. The study found that dosage compensation mechanisms, which balance gene expression between sexes, remained functional despite no longer being necessary for reproduction.

Propaganda risk 0%
Claims checked 8
Techniques found 0
Topics 0

Coverage spectrum

Coverage gap: Low Left coverage
Left0%
Center100%
Right0%

6 sources compared across this story cluster. This is an eFinder estimate from indexed source coverage, not an editorial rating.

What happened

One million years without sex fails to erase stick insects' unused biological system Robert Egan Senior Editor Scientists have made a surprising finding about how an asexually reproducing stick insect has evolved.

Why it matters

Darren Parker, lecturer in evolutionary biology at Bangor University, studied the genes of several species of Timema (a type of stick insect), which have not engaged in sexual reproduction for 1 million years—the longest known asexual period for any insect.

Common ground

The wingless stick insects are native to the far western United States and reproduce by a form of virgin birth in which an embryo develops from an unfertilized egg, bypassing the need for male fertilization.

Perspective signals

No major persuasion pattern has been attached yet, so the source, headline, and evidence should carry most of the weight for readers.

Researchers led by Dr. Darren Parker studied Timema stick insects that have reproduced asexually for one million years. The study found that dosage compensation mechanisms, which balance gene expression between sexes, remained functional despite no longer being necessary for reproduction.

open_in_new Read the original article: https://phys.org/news/2026-08-million-years-sex-erase-insects.html

analyticsAnalysis

0%
Propaganda Score
confidence: 100%
Low risk. This article shows minimal use of propaganda techniques.

fact_checkClaims Checked

eFinder analyzed this article and checked 8 claims against available evidence, cross-references, web search, and Wikipedia. Here is what the fact-checking layer found.

info Single Source 5
check_circle Corroborated 2
verified Verified By Reference 1
info
Claim 1: “dosage compensation mechanisms remained fully functional despite not being needed for over a million years.”
SINGLE SOURCE
The claim that dosage compensation mechanisms remained functional after a million years is reported in one specific search result headline.
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web search NEUTRAL — Prokaryotes (Archaea and Bacteria) reproduce asexually through binary fission, in which the parent organism divides in two to produce two genetically identical daughter organisms.
https://en.wikipedia.org/wiki/Asexual_reproduction
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web search NEUTRAL — Scientists make surprising finding about insects that reproduce without sex. Timema poppense perfectly camouflaged on its host, Redwood Sequoia sempervirens, California. This and other, closely relate…
https://phys.org/news/2026-08-million-years-sex-erase-insect…
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web search NEUTRAL — Asexual stick insects that have reproduced without male fertilisation for a million years have managed to retain a male-female gene-balancing mechanism, a study has found.
https://www.bbc.com/news/articles/cly906dyj50o
info
Claim 2: “the study, published in PNAS”
SINGLE SOURCE
While PNAS is a real journal and Timema is a real study subject, the specific link between this particular study and PNAS is only mentioned in one search result snippet. Other PNAS results are generic.
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wikipedia NEUTRAL — Asexual reproduction is a type of reproduction that does not involve the fusion of gametes or change in the number of chromosomes. The offspring that arise by asexual reproduction from either unicellu…
https://en.wikipedia.org/wiki/Asexual_reproduction
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wikipedia NEUTRAL — Tanja Schwander (born 1978) is a Swiss evolutionary biologist and professor at the University of Lausanne. She is known for her work on the evolution of sexual reproduction. She was awarded the John M…
https://en.wikipedia.org/wiki/Tanja_Schwander
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wikipedia NEUTRAL — Tisamenus hystrix is a stick insect species (Phasmatodea), in the family of the Heteropterygidae endemic to the Philippines.
https://en.wikipedia.org/wiki/Tisamenus_hystrix
+ 3 more evidence sources
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Claim 3: “Research led by Dr. Darren Parker, lecturer in evolutionary biology at Bangor University, studied the genes of several species of Timema (a type of stick insect)”
CORROBORATED
Multiple sources confirm Dr. Darren Parker is a lecturer at Bangor University (and University of Lausanne) and has conducted research on Timema stick insects.
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wikipedia NEUTRAL — This is a list of active duty United States Air Force major generals collected from publicly available and accessible information.
https://en.wikipedia.org/wiki/List_of_active_duty_United_Sta…
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wikipedia NEUTRAL — A general election was held in the United Kingdom on 4 July 2024 to elect all 650 members of the House of Commons. The opposition Labour Party, led by Keir Starmer, won a landslide victory over the go…
https://en.wikipedia.org/wiki/2024_United_Kingdom_general_el…
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wikipedia NEUTRAL — The 2025 New Year Honours are appointments by King Charles III among the 15 Commonwealth realms to various orders and honours to recognise and reward good works by citizens of those countries. The New…
https://en.wikipedia.org/wiki/2025_New_Year_Honours
+ 3 more evidence sources
info
Claim 4: “Darren J. Parker et al, Dosage compensation and meiotic sex chromosome inactivation are maintained under relaxed selection, Proceedings of the National Academy of Sciences (2026). DOI: 10.1073/pnas.2531501123”
SINGLE SOURCE
The specific citation (title, DOI, and 2026 date) is not corroborated by any of the other provided evidence; the other search results for 'Paper' are generic Wikipedia entries about physical paper.
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wikipedia NEUTRAL — Ferae ( FEER-ee, Latin: [ˈfɛrae̯], "wild beasts") is a mirorder of placental mammals in grandorder Ferungulata, that groups together clades Pan-Carnivora (that includes carnivorans and their fossil re…
https://en.wikipedia.org/wiki/Ferae
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wikipedia NEUTRAL — This list of impact structures (including impact craters) on Earth contains the majority of the 194+ confirmed impact structures given in the Earth Impact Database as of 2024. Alphabetical lists for d…
https://en.wikipedia.org/wiki/List_of_impact_structures_on_E…
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wikipedia NEUTRAL — This list compares various energies in joules (J), organized by order of magnitude.
https://en.wikipedia.org/wiki/Orders_of_magnitude_(energy)
+ 3 more evidence sources
info
Claim 5: “Males and females have a different number of X chromosomes; males have one (XY), and females have two (XX).”
SINGLE SOURCE
The provided evidence for this claim consists entirely of dictionary definitions for the word 'studied' and does not contain biological data regarding X chromosomes in Timema.
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web search NEUTRAL — Aug 13, 2026 · The meaning of STUDIED is carefully considered or prepared : thoughtful. How to use studied in a sentence.
https://www.merriam-webster.com/dictionary/studied
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web search NEUTRAL — Feb 10, 2026 · To wrap things up, studied is a versatile word essential for expressing past actions, thorough investigations, or ongoing efforts. Correct positioning in sentences, understanding tense …
https://englishwordchamps.com/studied-meaning-and-examples/
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web search NEUTRAL — STUDIED definition: 1. very carefully and intentionally done, made, or considered, rather than in a completely honest…. Learn more.
https://dictionary.cambridge.org/dictionary/english/studied
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Claim 6: “reproduce by a form of virgin birth in which an embryo develops from an unfertilized egg, bypassing the need for male fertilization. This phenomenon, known as parthenogenesis, occurs naturally in some animal species.”
CORROBORATED
Multiple sources confirm that stick insects reproduce via parthenogenesis (embryos from unfertilized eggs).
travel_explore
web search NEUTRAL — They reproduce through parthenogenesis: offspring develop from unfertilised eggs. No males, no mating – and yet the species survives. Other groups use both sexual and asexual reproduction.
https://hamburg.leibniz-lib.de/en/exhibitions/permanent-exhi…
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web search NEUTRAL — Heterogony is a form of facultative parthenogenesis where females alternate between sexual and asexual reproduction at regular intervals (see Alternation between sexual and asexual reproduction). Aphi…
https://en.wikipedia.org/wiki/Asexual_reproduction
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web search NEUTRAL — Spontaneous parthenogenesis refers. to rare hatching of unfertilized eggs in sexual species. Intra-specific origin refers to cases in which. female-only populations can be maintained, either in natura…
https://www.researchgate.net/publication/389915122_On_the_Re…
verified
Claim 7: “The wingless stick insects are native to the far western United States”
VERIFIED BY REFERENCE
Wikipedia explicitly states that Timema is a genus of wingless stick insects native to the far western United States.
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wikipedia NEUTRAL — The Phasmatodea (also known as Phasmida or Phasmatoptera) are an order of insects whose members are variously known as stick insects, stick bugs, walkingsticks, stick animals, or bug sticks. They are …
https://en.wikipedia.org/wiki/Phasmatodea
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wikipedia NEUTRAL — Timema is a genus of relatively short-bodied, stout and wingless stick insects native to the far western United States, and the sole extant member of the family Timematidae. The genus was first descr…
https://en.wikipedia.org/wiki/Timema
travel_explore
web search NEUTRAL — View the latest standings in the Premier League table, along with form guides and season archives, on the official website of the Premier League.
https://www.premierleague.com/en/tables/premier-league
+ 2 more evidence sources
info
Claim 8: “several species of Timema (a type of stick insect), which have not engaged in sexual reproduction for 1 million years—the longest known asexual period for any insect.”
SINGLE SOURCE
The specific claim regarding the '1 million years' asexual period is only found in one provided web search result. Other search results for 'SOME' are irrelevant dictionary entries.
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web search NEUTRAL — Our dining hall staff hosted the SOME Fashion Show, featuring SOME clients as models who hand-picked their outfits from the SOME Clothing Room. Every piece came from our collection of hundreds of fash…
https://some.org/
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web search NEUTRAL — SOME definition: 1. an amount or number of something that is not stated or not known; a part of something: 2. a…. Learn more.
https://dictionary.cambridge.org/dictionary/english/some
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web search NEUTRAL — Jul 30, 2026 · When some is used without a number, most commentators feel that somewhat is to be preferred. Their advice is an oversimplification, however; only when some modifies an adjective, usuall…
https://www.merriam-webster.com/dictionary/some
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.