Primatology: Monkey Bromance
نویسنده
چکیده
problem (hybrid seed sterility) snowball with divergence while another (hybrid pollen sterility) does not? The snowball prediction depends on the combinatorial pile-up of pairs, triplets, and so on, of independently accumulated substitutions, each of which has some probability of being incompatible. But if a substitution can be incompatible only with substitutions at one other specific locus, then there can be no combinatorial explosion of possible DMIs and thus no snowball [7]. There are at least two plausible ways in which substitutions might be incompatible with only one other substitution. First, a slightly deleterious mutation might be compensated by a second-site substitution, often occurring in the same gene [18]. No snowball is expected under this kind of compensatory evolution [7,14], and indeed none is found in molecular evolution studies [18,19]. Second, a special case of compensatory evolution occurs between selfish genetic elements, like meiotic drive factors that obtain transmission advantages at the expense of their bearers, and the specific genomic substitutions that evolve to suppress them (Rob Unckless and Allen Orr, personal communication). The third big advance in speciation genetics — the recent burst of molecular analyses of DMI genes — is especially relevant here. An emerging consensus from this work is that molecular arms races between selfish genetic elements and their suppressors often contribute to the evolution of DMIs [20]. Genetic study of one aspect of speciation — the evolution of hybrid sterility and inviability — suggests a previously unappreciated fraction of genomic evolution occurs to suppress and ameliorate the deleterious consequences of genomic parasites.
منابع مشابه
Primatology: Monkey Bromance
Male macaques form strong social bonds that enhance competitive ability and mating success, belying theoretical predictions that mate competition should prevent males from cooperating with one another.
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