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Sex ratio theory: Fisher's principle & its deviations






Extraordinary sex ratios male mumble females

So why make lots of males? Hamilton suggested that disease — carried by parasites — may be the critical factor. In the first volume , these prefaces are brief scene-setting essays; in the second, they have evolved into lengthy free-association sermons. Although it was primarily about animals especially social insects such as ants , Wilson had also ventured boldly into human territory, settling firmly for nature in the face of the nature-nurture divide. My advisor said to me one day, "mumble mumble dominance Hamilton was studying wasps in Brazil when his ultimately famous paper on altruism was published: Then read the first paragraph of Hamilton's Extraordinary Sex Ratios. Are you slackjawed yet? Perhaps now you will understand why so many evilutionary biologists hold Bill Hamilton in such high esteem.

Extraordinary sex ratios male mumble females


Hamilton suggested that disease — carried by parasites — may be the critical factor. OK, I'll start with that one. Bill Hamilton died on 7 March from complications of malaria. Maybe one of these new variants holds the key to overcoming the parasite. However, the frequency of the gene will eventually reach a point where the sex ratio of the species is now male-biased, whereupon the alternative, a gene promoting the production of females, will be favoured, and so on. I'm not meaning this to be a counter-argument, more of a brain-dump of things I'm finding confusing, interesting, or both in this discussion Since the blackboard went all the way down to the floor, he had to get on his hands and knees in order to write down there, and this made his murmuring voice even more inaudible. In the case of parasitic wasps, whose larvae gruesomely consume the insides of a living caterpillar, a single female inserts a batch of eggs into a caterpillar. My advisor said to me one day, "mumble mumble dominance On the other hand, of the three countries DPR Korea, Myanmar, and Thailand which had higher percentage of females than males, two Myanmar and Thailand continued to do so at still higher rate in but it slowed down in DPR Korea in favor of males. At least he isn't a virgin. The drawing above is Fig. So finally I too will shine like a violet ground beetle under a stone. Posted by John Dennehy at 4: Think of a mutant female — a hermaphrodite — who can reproduce without male input, and whose offspring have the same ability. I wonder if anyone's done genetic diversity studies of deer populations comparing "hunting allowed" and "no hunting" like national parks? I'd almost say sex ratio and reproductive strategy seems to have different selective advantage or disadvantage based on context, and is often neutral enough that animals have drifted into a diverse set of strategies. These may yield a whole fleet of females, but just one male. OK, sort by times cited. Although it was primarily about animals especially social insects such as ants , Wilson had also ventured boldly into human territory, settling firmly for nature in the face of the nature-nurture divide. I doubt it, though. It also seemed to be at odds with Hamilton himself. These mites usually occur in broods biased in favor of females, and they are quite naughty. By , only two countries India and Bhutan in the Region continue to have skewed above sex ratio. Thus, the sex ratio of total population is expected to equalize.

Extraordinary sex ratios male mumble females


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4 thoughts on “Extraordinary sex ratios male mumble females

  1. Kazragis Reply

    Each article is prefaced by an autobiographical account of its genesis and by other retrospective thoughts. It also seemed to be at odds with Hamilton himself.

  2. Fenrigami Reply

    A female bird choosing her mate among males is keen to pick an individual with good genes because some of them will be passed on to her offspring. Hamilton died unexpectedly three years ago, before the editing of the second volume was complete, so maybe this self-indulgence was never intended for public consumption.

  3. Mikazilkree Reply

    Bill Hamilton died on 7 March from complications of malaria.

  4. Faukinos Reply

    Sex ratio is one of those things that seems obvious until you start to think about it. My reaction on reading the first page:

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