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The ovum carrying the new genetic material is allowed to develop into an embryo and then transferred into the womb of a surrogate, which ultimately gives birth to an exact duplicate of the animal from which the donor cell was taken.—Jeffrey Kluger, Time, 7 Apr. 2025 The exterior membrane of a dunnart ovum, which is about 0.2 millimetres in diameter, turns out to be very difficult to penetrate, Ord explained.—D. T. Max, New Yorker, 7 Apr. 2025 Kate Mara Before welcoming her daughter in 2019, Fantastic Four and House of Cards actress Kate Mara experienced a miscarriage known as a blighted ovum.—Mia Taylor, Parents, 16 Oct. 2024 This cap contains enzymes that help the sperm enter the ovum (egg).—Heather Jones, Verywell Health, 19 Sep. 2024 The ovum carries an X chromosome, while sperm cells can carry either an X or a Y chromosome.—Heather Jones, Verywell Health, 19 Sep. 2024 If a sperm cell carrying an X chromosome fertilizes the ovum, the fetus will be genetically female.—Heather Jones, Verywell Health, 19 Sep. 2024 The most common places for an ectopic pregnancy are along the path the ovum (egg) travels, meaning from the ovary, through the fallopian tube (which carries the ovum from the ovary to the uterus) and the uterus, and even its opening, the cervix.—Dr. Keith Roach, oregonlive, 6 May 2022 One of the two missing eggs is known as the Cherub with Chariot, which depicts a chubby baby angel pulling an ovum on a carriage.—Stu Woo and Aruna Viswanatha, WSJ, 7 Dec. 2022
especially: a mature egg that has undergone reduction, is ready for fertilization, and takes the form of a relatively large inactive gamete providing a comparatively great amount of reserve material and contributing most of the cytoplasm of the zygote
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