Transgressive Hybrids as Hopeful Monsters

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@R3RT0 are examples of this. https://t.co/Zuyf5TBD0f. Even the existence of invasive species counts against the Fisherian assumption. Organisms with no history of adaptive evolution in a given setting (essentially representing hopeful monsters) can sometim

"Transgressive segregation might be just the mechanism to make more monsters hopeful." https://t.co/Hox9Ti1Ji7

Gene exchange "is perhaps the most likely mechanism of sudden, population level change." https://t.co/Hox9Ti1Ji7

"Gene exchange is not the sole, nor even necessarily most likely, source of evolutionary novelty." https://t.co/Hox9Ti1Ji7

Admixture can generate multilocus novelties that might never have appeared via gradual accumulation. https://t.co/Hox9Ti1Ji7

"Admixture can simultaneously bring together many new combinations of alleles." https://t.co/Hox9Ti1Ji7

If a rare transgressive hybrid could rapidly fix in a population it could establish a novel lineage. https://t.co/Hox9Ti1Ji7

Even if most of the variation is deleterious, a rare transgressive hybrid genotype could rapidly fix in a population https://t.co/Hox9Ti1Ji7

Transgressive segregation might promote sudden phenotypic changes in evolution. https://t.co/Hox9Ti1Ji7

Recombination "might be the most credible mechanism for sudden appearance of new forms." https://t.co/Hox9Ti1Ji7

"Recombination is not the only (or even most common) process generating evolutionary novelty." https://t.co/Hox9Ti1Ji7

Admixed populations increase the chances that recombinant hopeful monsters will establish true-breeding lineages. https://t.co/Hox9Ti1Ji7

"Admixed populations will also produce many similar recombinant phenotypes at the same time." https://t.co/Hox9Ti1Ji7

"Whether such variation is perceived as profound or “monstrous” is a matter of degree rather than kind." https://t.co/Hox9Ti1Ji7

"Recombination has always been recognized as an important source of variation." https://t.co/Hox9Ti1Ji7

These cases are "reminiscent of Goldschmidt’s hopeful monsters." https://t.co/Hox9Ti1Ji7

These cases illustrate sudden appearance of profound differences between parents and hybrid offspring. https://t.co/Hox9Ti1Ji7

New phenotypes from hybridization: expression of novel gene transcripts via alternative splicing in hybrid poplars. https://t.co/Hox9Ti1Ji7

New phenotypes from hybridization: specialization on a novel host plant in lonicera flies. https://t.co/Hox9Ti1Ji7

New phenotypes from hybridization: ability of recombinant sunflowers to thrive in extreme habits. https://t.co/Hox9Ti1Ji7

New phenotypes from hybridization: unique shapes and colors of hybrid orchids. https://t.co/Hox9Ti1Ji7

New phenotypes from hybridization: extreme size of tiger x lion F1 hybrids. https://t.co/Hox9Ti1Ji7

Transgressive hybrids can increase the likelihood of divergence from parental populations. https://t.co/Hox9Ti1Ji7

"Often, transgressive hybrids have higher fitness in novel environments." https://t.co/Hox9Ti1Ji7

Transgressive phenotypes can be "additive effects of multiple recombined loci." https://t.co/Hox9Ti1Ji7

"Transgressive phenotypes can be products of epistatic interactions." https://t.co/Hox9Ti1Ji7

Transgressive phenotypes are "monstrous phenotypes beyond the range of parental populations." https://t.co/Hox9Ti1Ji7

"Genetic recombination in hybrids can produce transgressive phenotypes." https://t.co/Hox9Ti1Ji7

Transgressive segregation can express phenotypes outside the normal range observed in either parental gene pool. https://t.co/Hox9Ti1Ji7

Recent research "on hybrid speciation might have revived the hopeful monster in a new, more credible form." https://t.co/Hox9Ti1Ji7

Population genetics explains the origin of new species, and simultaneously exposed flaws in the alternatives. https://t.co/Hox9Ti1Ji7

Story of my life right here: https://t.co/Je8hq9H37Y

A hopeful monster: "the resulting improbability of finding an equally monstrous mate." https://t.co/Hox9Ti1Ji7

A hopeful monster: "the rarity of the initial mutation of large effect." https://t.co/Hox9Ti1Ji7

A hopeful monster "was criticized early for being so improbable as to “overtax one’s credulity”." https://t.co/Hox9Ti1Ji7

A hopeful monster requires "a novel niche for which its monstrosity happens to be preadapted." https://t.co/Hox9Ti1Ji7

"A hopeful monster is an individual phenotypically discontinuous from the range of phenotypes of its population." https://t.co/Hox9Ti1Ji7

Hopeful monsters "emphasize that their appearance is neither purposeful nor gradual, and...a matter of luck." https://t.co/Hox9Ti1Ji7

"Individuals bearing such macromutations were characterized as “hopeful monsters” by Goldschmidt." https://t.co/Hox9Ti1Ji7

Goldschmidt's novel phenotype "must first arise as an instantaneous product of a single “macromutation”." https://t.co/Hox9Ti1Ji7

Goldschmidt's novel phenotype (such as insect wings, a character associated with higher level taxonomy)." https://t.co/Hox9Ti1Ji7

Genetic revolutions permit the conventional dynamics of mutation, gene flow, drift and selection. https://t.co/Hox9Ti1Ji7

Genetic revolutions avoid difficulties with the emergence of profound change as the accumulation of subtle changes. https://t.co/Hox9Ti1Ji7

"Some theorists have invoked special phenomena such as genome-wide “macromutations” or “genetic revolutions”." https://t.co/Hox9Ti1Ji7

Recent work on hybridization "is entirely consistent with the principles of modern population genetics." https://t.co/Hox9Ti1Ji7

Recent work "suggests an underappreciated mechanism for the sudden appearance of evolutionary novelty." https://t.co/Hox9Ti1Ji7

Saltations. "A lingering fascination with the possibility of sudden, dramatic change has persisted." https://t.co/Hox9Ti1Ji7

Saltations. "These ideas were easily dismissed by the insights of the Modern Synthesis." https://t.co/Hox9Ti1Ji7

"When these recombinant phenotypes have fitness beyond the range of parental phenotypes they are transgressive." https://t.co/Hox9Ti1Ji7

Recombination in the F2 and later generations can produce hybrids with phenotypes novel to both parents. https://t.co/Hox9Ti1Ji7

Hybridization producing novel forms: "several case studies of homoploid hybrid speciation." https://t.co/Hox9Ti1Ji7

The idea of hybridization rapidly producing novel forms rarely appeared in mainstream discussions of speciation. https://t.co/Hox9Ti1Ji7

"The idea that hybridization can rapidly produce novel forms is familiar among botanists." https://t.co/Hox9Ti1Ji7

"The origin of novelty...consistent with the fundamental genetic principles of gradual populational change." https://t.co/Hox9Ti1Ji7

"A major task for evolutionary biology has been to develop and test theories for the origin of novelty." https://t.co/Hox9Ti1Ji7

The sudden appearance of new species "epitomized by Goldschmidt’s infamous “hopeful monster”." https://t.co/Hox9Ti1Ji7

"Early geneticists speculated about the sudden appearance of new species via special macromutations." https://t.co/Hox9Ti1Ji7

"The origin of novelty is a critical subject for evolutionary biologists." https://t.co/Hox9Ti1Ji7

A hopeful monster "finding a novel niche for which its monstrosity happens to be preadapted." https://t.co/Hox9Ti1Ji7

"A hopeful monster is an individual phenotypically discontinuous from the range of phenotypes of its population." https://t.co/Hox9Ti1Ji7

A hopeful monster is a freak of extreme hybridization between species. https://t.co/Hox9Ti1Ji7

"A hopeful monster...finding a novel niche for which its monstrosity happens to be preadapted." https://t.co/Hox9Ti1Ji7

"A hopeful monster is an individual phenotypically discontinuous from the range of phenotypes of its population." https://t.co/Hox9Ti1Ji7