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• Fertilization occurs when an egg and sperm meet in the fallopian tubes, after which cilia move the resulting embryo to the uterus.
• The father determines the sex of the fetus because the mother's egg contains an X chromosome, while the father's sperm contains either an X or Y chromosome.
• During the menstrual cycle, an ovary releases an ovum that travels through the fallopian tube into the uterus; if the ovum meets sperm, a zygote is created.
• If an egg released during ovulation is not fertilized by sperm, the uterine lining breaks down and sheds, resulting in a menstrual period.
• Coral reefs synchronize the release of egg and sperm in response to the proximity of a full moon, resulting in the largest spawning event on Earth.
• Fertilization occurs when a sperm meets an egg, creating a zygote that eventually develops into a fetus.
• Seedless vascular plants require water for fertilization because their sperm must swim on a layer of moisture to reach the egg, which explains why ferns and their relatives are more abundant in damp environments.
• If an egg is fertilized by sperm during the luteal phase, it may attach to the uterine lining to begin pregnancy.
• When considering whether a hypothetical person ('Jones2') created from a slightly modified sperm and the same egg would be the same person as the original 'Jones,' there are three potential answers: (i) the person either would or would not have existed, but it is unknowable; (ii) there is no fact of the matter regarding existence; or (iii) the person would have existed to some degree or in some ways, possessing an overlap of psychic constitution with the original.
• Coral broadcast spawning involves releasing egg and sperm in packages called spherical gametes, which dissolve to allow fertilization, after which larvae develop and are dispersed by currents over long distances to settle on distant reefs.
• The uterine tubes (also known as oviducts or fallopian tubes) are bilateral appendages located at the superior portion of the uterine cavity that transport sperm toward the egg and facilitate the passage of the fertilized egg to the uterus for implantation. They connect the endometrial and peritoneal cavities, exiting the uterus through the cornua. The tubes consist of three segments: the isthmus (closest to the uterus), the ampulla (the dilated middle segment where fertilization typically occurs), and the infundibulum (the distal segment). The infundibulum features fimbriae, which are fingerlike projections that capture the egg released by the ovary.
• Fertilization of an egg by sperm normally occurs in the fallopian tubes, after which the fertilized egg moves to the uterus to implant into the uterine lining.
• The uterus produces secretions that assist the transit of sperm to the fallopian tubes, where fertilization of an ovum can occur.