Genetic speciation is the biological process by which reproductive isolation between populations evolves primarily through genetic divergence, leading to the formation of distinct species. It involves the accumulation of heritable genetic differences via mutation, recombination, genetic drift, and natural or sexual selection, which alter allele frequencies and genomic architecture. These changes can generate prezygotic or postzygotic barriers, such as behavioral incompatibilities, hybrid sterility, or reduced hybrid viability. Genetic speciation may occur in various geographic contexts (allopatric, sympatric, parapatric) and is often associated with genomic features like chromosomal rearrangements, divergence in gene regulatory networks, and the fixation of Dobzhansky–Muller incompatibilities.
A simple change in species composition can impact the course of evolution: A research team from the University of Bern and the University of British Columbia in Canada shows that the presence of just one other fish species ...
Evolution
Oct 15, 2025
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35
Over a few million years, the spider Dysdera tilosensis—a species endemic to the Canary Islands—has reduced the size of its genome by half during the process of colonization and adaptation to its natural habitat. In addition ...
Evolution
Oct 13, 2025
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341
After humans started using the Baltic Sea, its diatom populations started to experience accelerated—and, so far, irreversible—changes in genetic composition and diversity, according a recent study led by researchers in Konstanz.
Ecology
Sep 26, 2025
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In about one out of every 800 people, two chromosomes fuse together to form an unusual bond. These are known as Robertsonian chromosomes. It's a mystery that has long stumped scientists.
Evolution
Sep 24, 2025
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199
When individuals from two different species interbreed, hybrid organisms may emerge that display characteristics from both genetic lineages. While hybridization is a common natural phenomenon, it is often seen as a challenge ...
Evolution
Sep 5, 2025
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125
University of California Berkeley researchers report that females of two jumping spider species prefer red ornamented males of Habronattus americanus, a pattern that drives interspecific mating with a trend toward hybridized ...
Toddlers can name a few animals. Older kids group animals into categories (birds, fish). And teenagers can sketch a rough tree of life. But when 16 grown-up biologists—five of them affiliated with the Smithsonian Tropical ...
Plants & Animals
Aug 4, 2025
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153
For many ant species, caste determines destiny. Queens grow large, sprout wings, and lay eggs; workers stay small, wingless, and industrious. But how these castes develop—and how a young ant's future is determined by genetics ...
Plants & Animals
Jul 21, 2025
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46
Scientists have long assumed that anemonefish's tight-knit relationship with sea anemones, their protective hosts, was the main engine behind their evolutionary diversification. But the team wondered if other ecological factors ...
Plants & Animals
Jul 16, 2025
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25
Researchers have found that chunks of "flipped" DNA can help fish quickly adapt to new habitats and evolve into new species, acting as evolutionary "superchargers."
Evolution
Jun 12, 2025
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