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Epigenetic Avenues In most animals, a sperm cell is tiny compared to an egg cell.—Ivan Amato, Quanta Magazine, 22 Dec. 2025 The research points to a slower biological degradation or a certain resistance to aging in egg cells than often feared—complicating the prevailing narrative that fertility will inevitably plummet by a woman’s 30s in every case.—Melissa Fleur Afshar, MSNBC Newsweek, 3 Dec. 2025 New variation emerges from reshuffling segments of DNA in sperm and egg cells, and from copying errors known as mutations.—F.d. Flam, Mercury News, 26 Nov. 2025 Traditionally, scientists have believed that telomere length is either a polygenic trait, controlled by multiple genes, or is passed directly to the offspring through parental sperm and egg cells.—New Atlas, 2 Oct. 2025 See All Example Sentences for egg cell