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Read Time: In most living animals, egg cells are vastly larger than sperm cells. In humans, for example, a single egg is 10 million times the volume of a sperm cell. In a new study, Northwestern University researchers found that competition and natural selection drove this curious size discrepancy. Using mathematical modeling, the researchers considered a time very early in evolution when primordial species reproduced using external fertilization. In the model, bigger reproductive cells, or gametes, presented a competitive edge because they could hold more nutrients for a potential zygote. Smaller gametes, however, required fewer resources to make, which put less stress on the parent.

Charles darwinNathan whiteJoseph johnsonAlain kangabireDaniel abramsNorthwestern mccormick school of engineeringNorthwestern universityMccormick schoolசார்லஸ் டார்வின்நாதன் வெள்ளைஜோசப் ஜான்சன்வடமேற்கு ம்க்கார்‌மிக் பள்ளி ஆஃப் பொறியியல்வடமேற்கு பல்கலைக்கழகம்ம்க்கார்‌மிக் பள்ளி