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a father have nothing but daughters could
achieve its object by making him manufacture nothing but X-
sperms. A gene for making a mother have nothing but daughters
could work by making her secrete a selective spermicideor by
making her abort male embryos. What we seek is something
equivalent to an evolutionarily stable strategy (ESS)although here
even more than in the on aggressionstrategy is just a
figure of speech. An individual cannot literally choose the sex of his
children. But genes for tending to have children of one sex or the
other are possible. If we suppose that such genesfavouring
unequal sex ratiosexistare any of them likely to become more
numerous in the gene pool than their rival alleleswhich favour an
equal sex ratio?
Suppose that in the elephant seals mentioned abovea mutant
gene arose that tended to make parents have mostly daughters. Since
there is no shortage of males in the populationthe daughters would
have no trouble finding matesand the daughter-manufacturing
gene could spread. The sex ratio in the population might then start to
shift towards a surplus of f [link widoczny dla zalogowanych][link widoczny dla zalogowanych]les. From the point of view of the good
of the speciesthis would be all rightbecause just a few males are
quite capablyilai:
[link widoczny dla zalogowanych]

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