Which sperm will win the race to the egg: the green one or the red one?

Thursday, March 18, 2010 - 18:07 in Biology & Nature

Once they're inside the female reproductive organs, sperm pull out all the stops to outrace their rivals to the egg--especially if the opponent comes from another male. The process that determines which sperm wins, called "postcopulatory sexual selection," has been difficult to tease out, until now.

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