scholarly journals The evolution of polyandry II: post–copulatory defenses against genetic incompatibility

1997 ◽  
Vol 264 (1378) ◽  
pp. 69-75 ◽  
Author(s):  
Jeanne A. Zeh ◽  
David W. Zeh
Keyword(s):  
Genetic Incompatibility ◽  
Evolution Of Polyandry

scholarly journals The optimal mating distance resulting from heterosis and genetic incompatibility

2018 ◽  
Vol 4 (11) ◽  
pp. eaau5518 ◽  
Author(s):  
Xinzhu Wei ◽  
Jianzhi Zhang
Keyword(s):  
Animal Model ◽  
Genetic Distance ◽  
Polynomial Function ◽  
Genetic Distances ◽  
Quadratic Polynomial ◽  
Model Organisms ◽  
Genetic Incompatibility ◽  
Large Numbers ◽  
Practical Implications

Theory predicts that the fitness of an individual is maximized when the genetic distance between its parents (i.e., mating distance) is neither too small nor too large. However, decades of research have generally failed to validate this prediction or identify the optimal mating distance (OMD). Respectively analyzing large numbers of crosses of fungal, plant, and animal model organisms, we indeed find the hybrid phenotypic value a humped quadratic polynomial function of the mating distance for the vast majority of fitness-related traits examined, with different traits of the same species exhibiting similar OMDs. OMDs are generally slightly greater than the nucleotide diversities of the species concerned but smaller than the observed maximal intraspecific genetic distances. Hence, the benefit of heterosis is at least partially offset by the harm of genetic incompatibility even within species. These results have multiple theoretical and practical implications for speciation, conservation, and agriculture.

scholarly journals The collapse of genetic incompatibilities in a hybridizing population

2021 ◽  
Author(s):  
Tianzhu Xiong ◽  
James L MALLET
Keyword(s):  
Gene Regulation ◽  
Reproductive Isolation ◽  
Genetic Drift ◽  
Recombination Rate ◽  
Time Scale ◽  
Genetic Incompatibility ◽  
Genetic Process ◽  
Underlying Mechanisms ◽  
The Stability

Genetic incompatibility has long been considered to be a hallmark of speciation due to its role in reproductive isolation. Previous analyses of the stability of epistatic incompatibility show that it is subject to collapse upon hybridization. In the present work, we derive explicitly the distribution of the lifespan of two-locus incompatibilities, and show that genetic drift, along with recombination, is critical in determining the time scale of collapse. The first class of incompatibilities, where derived alleles separated in parental populations act antagonistically in hybrids, survive longer in smaller populations when incompatible alleles are (co)dominant and tightly linked, but collapse more quickly when they are recessive. The second class of incompatibilities, where fitness is reduced by disrupting co-evolved elements in gene regulation systems, collapse on a time scale proportional to the exponential of effective recombination rate. Overall, our result suggests that the effects of genetic drift and recombination on incompatibility's lifespan depend strongly on the underlying mechanisms of incompatibilities. As the time scale of collapse is usually shorter than the time scale of establishing a new incompatibility, the observed level of genetic incompatibilities in a particular hybridizing population may be shaped more by the collapse than by their initial accumulation. Therefore, a joint theory of accumulation-erosion of incompatibilities is in need to fully understand the genetic process under speciation with hybridization.

scholarly journals The colour of paternity: extra-pair paternity in the wild Gouldian finch does not appear to be driven by genetic incompatibility between morphs

2016 ◽  
Vol 30 (1) ◽  
pp. 174-190 ◽  
Author(s):  
P. E. Bolton ◽  
L. A. Rollins ◽  
J. Brazill-Boast ◽  
K-W. Kim ◽  
T. Burke ◽  
...  
Keyword(s):  
Genetic Incompatibility ◽  
Extra Pair Paternity ◽  
In The Wild ◽  
Gouldian Finch

scholarly journals Species-wide Genetic Incompatibility Analysis Identifies Immune Genes as Hot Spots of Deleterious Epistasis

Cell ◽  
2014 ◽  
Vol 159 (6) ◽  
pp. 1341-1351 ◽  
Author(s):  
Eunyoung Chae ◽  
Kirsten Bomblies ◽  
Sang-Tae Kim ◽  
Darya Karelina ◽  
Maricris Zaidem ◽  
...  
Keyword(s):  
Hot Spots ◽  
Genetic Incompatibility ◽  
Immune Genes
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