Abstract
Group advantage accounts for sex ratios (numbers of males versus females) in populations. For example, Darwin speculated that a 1:1 sex ratio in a population might minimize overall competition over mates, whereas other evolutionary biologists reasoned that a male-biased sex ratio would benefit a species because each male can sexually service many females, and still others argued that a female-biased sex ratio would be ideal because this would maximize a population’s reproductive output.
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