Reproductive isolation is a biological process that prevents gene flow between populations or species, thereby maintaining or promoting genetic divergence and speciation. It operates through prezygotic mechanisms, which inhibit mating or fertilization (e.g., temporal, ecological, behavioral, mechanical, and gametic isolation), and postzygotic mechanisms, which reduce the viability or fertility of hybrid offspring (e.g., hybrid inviability, sterility, or breakdown). These barriers can arise via natural selection, genetic drift, or chromosomal changes and are often reinforced when hybridization is maladaptive, ultimately stabilizing distinct evolutionary lineages.
When closely related species mate, their offspring sometimes survive but cannot reproduce. This pattern often affects males first, with hybrid males frequently failing to produce functional sperm even when hybrid females ...
Evolution
Mar 9, 2026
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There are many ways to communicate with prospective romantic partners. If you are a Japanese scarab beetle, it's a matter of distinguishing left from right. New work from U.S. and Chinese scientists, published this week in ...
Plants & Animals
Feb 21, 2026
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In the plant world, when two different species mate, their offspring often don't survive. The reason lies in their DNA: incompatible genes often mix in their offspring, triggering a fatal breakdown known as hybrid lethality ...
Molecular & Computational biology
Feb 4, 2026
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45
One of the great mysteries in plant biology is how, given the clouds of pollen released by dozens of plant species all at the same time, an individual plant can recognize which particular species' pollen grains will induce ...
Molecular & Computational biology
Nov 21, 2025
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139
In a recent study, scientists from the Texas A&M College of Veterinary Medicine and Biomedical Sciences (VMBS) have utilized cutting-edge artificial intelligence methods to identify a region of the X chromosome that has maintained ...
Plants & Animals
Nov 12, 2025
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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 ...
Plants, with their unique immune systems, sometimes launch "autoimmune responses" by mistakenly identifying their own protein structures as pathogens. In particular, "hybrid necrosis," a phenomenon where descendant plants ...
Plants & Animals
Jul 21, 2025
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Wild plants can contribute valuable genes to their domesticated relatives. Fertility barriers and a lack of genomic resources have hindered the effective use of crop-wild introgressions. An international research team led ...
Molecular & Computational biology
Jul 9, 2025
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