Exact(1)
Of note, 58.4% (52/89) of the F2 strains were not able to form tetrads at all, and the underlying incompatibility is not clear, partly because the sample size is too small.
Similar(59)
Since the substitutions underlying BDM incompatibilities do not have to occur evenly in both lineages, a higher mutation rate in one lineage should drive divergence between them [ 47].
In recent years, the causal polymorphisms underlying BDM incompatibilities have been identified in a limited number of species, with divergence in both coding sequence and in regulatory elements producing incompatibilities (see Presgraves 2010 for review).
Although relatively few loci underlying hybrid incompatibilities have been identified, one theme that has emerged is that the loci are often rapidly evolving and implicated as players in 'molecular evolutionary arms races'.
Our findings in fission yeast are highly reminiscent of emerging themes from studies of reproductive isolation mechanisms in plants, insects and even mammals, in which genetic conflicts underlie hybrid incompatibilities (Johnson, 2010; Presgraves, 2010).
Note that F1 hybrids are not suitable for identifying genetic incompatibilities unless they are dominant, but a previous study has excluded the existence of dominant genetic incompatibilities underlying the infertility of the hybrid between Sc and Sp (Greig et al. 2002).
A common theme of the above theories is that they are phenomenological with respect to the underlying genetic basis of incompatibilities.
In the subsequent section, the EE is approached from the structural entity perspective and the incompatibility of the underlying firm-centric logic with meeting the performance management and measurement needs of EEs is explained.
This study revealed that hybrid sterility, which was previously thought to be due to deleterious epistatic interactions between genes from different species, had different underlying causes and dominant genic incompatibility either did not make any contribution or could be overcome by tetraploidy in yeast [ 139].
The availability of the X. maculatus reference genome and transcriptome assemblies have greatly accelerated the identification of differences that are coincidental with speciation, the evolution of genetic incompatibility, and the genetics underlying pigment pattern expression, and sex determination in Xiphophorus [ 1, 5– 10].
The true nature of the gene interactions can ultimately only be fully assessed by identifying the genes that underlie the hybrid incompatibilities.
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