Sometimes boys are worth more, sometimes girls are worth more. In an evolutionary sense. Or, more correctly, the value of a certain sex … as an offspring … can be measured in fitness terms. Fisher noted this and hypothesized this was the explanation for the 50-50 sex ratio we usually see. As one sex becomes more rare, it becomes more valuable, and thus parents (mothers, perhaps, usually) bias towards that sex. Then the disparity goes away and thus the differential value goes away.Of course, the truth is that we don’t actually see the 50-50 sex ratio all the time … many species of organisms have a highly biased sex ratio. Many have a highly biased ratio in adults, much more biased than in offspring. This sort of thing varies quite a bit. But what about humans, and what about the report that Indian girl-boy ratios at ‘all-time low’ … Continue reading
What do Bigfoot, Aliens and Sex have in common?
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