Fastest sperm may not be the best


Dr Angela Crean from UNSW School of Biological, Earth and Environmental Sciences has shown for the first time that the influence of sperm extends beyond the moment of conception—if you are a sea squirt, that is. Sea squirts eggs penetrated by speedy sperm tended to be non-viable, or produce juveniles that died young. The longest-lived sea squirts were those fertilised by sperm that swam for about 60 minutes before reaching the egg.

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