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I have also recently started collaborating with Jill Banfield, a geomicrobiologist at Berkeley in a study of the microbial interactions that generate acid mine drainage, and with earth scientists in a newly funded NSF Science and Technology Center, the National Center for Earth Surface Dynamics, in studies of the evolution of linked eco-geomorphic systems in watersheds.
Although theoretical models have long suggested joint evolution of linked genes on a chromosome, a mutation on a gene-regulatory region (that is, switching on/off of a single gene) might be sufficient to trigger two 'runaway' processes in different directions to promote (sympatric) speciation.
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Because of restriction of pairing and crossing over to the distal segments of the chromosomes tight co-evolution of linked alleles was established.
The evolution of links can be described as a Markov chain, which is the starting point for our analytical considerations.
First, irrespective of the underlying cause, fisheries-induced evolution of traits linked to reproductive success may lead to unanticipated consequences regarding the rate and direction of genetic change.
We also found that expression and molecular evolution of genes linked to the sex-determining region did not differ substantially from genes in other parts of the genome.
The presence of genes in a cluster would favor their co-segregation and thus favor the rapid evolution of the linked genes.
In this study we analysed the origin and evolution of the group of linked genes from which the mammalian XIC originated.
FISH and quantitative PCR experiments showed that in many genomes concerted evolution has homogenised thousands of linked units indicating that insertion of a putative 5S-carrying retroelement into IGS does not prevent unit amplification.
In the absence of direct evidence, the default hypothesis, probably, should be that these genes evolved from cellular genes as a result of dramatic acceleration of evolution linked to the emergence of new, virus-specific functions, such that all traces of the ancestral relationships are obliterated.
Devising a rational strategy to counter this hurdle might require a mechanistic understanding of the co-evolution of such linked traits.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com