Hybrid inviability is a post-zygotic barrier, which reduces a hybrid's capacity to mature into a healthy, fit adult.[1] The relatively low health of these hybrids relative to pure-breed individuals prevents gene flow between species. Thus, hybrid inviability acts as an isolating mechanism, limiting hybridization and allowing for the differentiation of species.
The barrier of hybrid inviability occurs after mating species overcome pre-zygotic barriers (behavioral, mechanical, etc.) to produce a zygote. The barrier emerges from the cumulative effect of parental genes; these conflicting genes interfere with the embryo's development and prevents its maturation. Most often, the hybrid embryo dies before birth. However, sometimes, the offspring develops fully with mixed traits, forming a frail, often infertile adult.[2] This hybrid displays reduced fitness, marked by decreased rates of survival and reproduction relative to the parent species. The offspring fails to compete with purebred individuals, limiting genes flow between species.[3]
^Hybrid inviability. (2009). In Encyclopædia Britannica. Retrieved November 03, 2009, from Encyclopædia Britannica Online: http://www.britannica.com/EBchecked/topic/278018/hybrid-inviability
^Campbell, N. A., J. B. Reece, L. A. Urry, M. L. Cain, S. A. Wasserman, P. V. Minorsky, and R. B. Jackson. 2008. Biology: Eighth Ed. San Francisco, CA:491.
^Freeman, S., and J. C. Herron. 2007. Evolutionary Analysis:Fourth Ed. Upper Saddle River, NJ:627.
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Hybridinviability is a post-zygotic barrier, which reduces a hybrid's capacity to mature into a healthy, fit adult. The relatively low health of these...
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cause hybridinviability or sterility regardless of the environment in which they occur, while extrinsic postzygotic barriers result in hybrids of low...
that hybrid offspring are sterile, but fertile hybrids may result in speciation. hybrid breakdown hybrid incompatibility hybridinviabilityhybrid speciation...
generation.[citation needed] Being hybrids, Savannahs typically exhibit some characteristics of hybridinviability. Because the male Savannah is the heterogametic...
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Namely, in the center of the hybrid zone, negative selection purges alleles against hybrid disadvantage (e.g. hybridinviability or infertility). Stated differently...
melanogaster", Current Biology "Adaptive evolution drives divergence of a hybridinviability gene between two species of Drosophila", Nature "Linkage limits the...
mate with Drosophila neotestacea males, but viable hybrids are never produced. This hybridinviability (see Haldane's rule)) may be due to selfish X chromosomes...
The fertile hybrids of European water frogs (genus Pelophylax) reproduce by hybridogenesis (hemiclonally). This means that during gametogenesis, they...
biologist J. B. S. Haldane first recorded in 1922 that genetic hybrids are often inviable or sterile. Since none of the males are fertile, the females must...
species. This could cause the heterogametic sex chromosome in the hybrid to be inviable or sterile, but homogametic sex chromosome will be fertile. Consequently...
variation in hybridinviability. Hybrid offspring from a Christmas darter female were often severely deformed, dying before hatching. The hybrid offspring...
who declared that Darwin failed to explain the origins of inviability and sterility in hybrids. Similar claims were promulgated by the mutationist school...
characteristic of being inviable. By December 2008, the remaining eggs had failed to hatch and X-rays showed that they were inviable. On July 23, 2009, exactly...
This suggests that not only incompatible pollen is involved but also inviability at the seedling stage. A study in 2022 using a commercial cultivar found...
of many interspecific and intergeneric food and ornamental plant crop hybrids. This technique nurtures the immature or weak embryo, thus allowing it...
deletions and duplications. The offspring produced by such gametes are mostly inviable, and therefore, recombination is indirectly suppressed within inverted...
speciation occurring in nature. Selection against migrants, or immigrant inviability, is hypothesized to be a form of ecological isolation. This type of speciation...
cell cycle. A double deletion of BCK2 and G1 cyclin CLN3 results in inviability or extremely slow growth. This was found to be a result of G1 arrest...
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