A female stores sperm and can determine the sex of each egg she lays by fertilizing it or leaving it unfertilized.
Hamilton, noting that the eggs develop within their hostthe larva of another insect
Since only one female usually lays eggs in a given larva, it would pay her to produce one male only, because this one male could fertilize all his sisters on emergence.
and that the newly emerged adult wasps mate immediately and disperse, offered a remarkably cogent analysis
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