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  2. Sperm - Wikipedia

    en.wikipedia.org/wiki/Sperm

    Sperm cells cannot divide and have a limited lifespan, but after fusion with egg cells during fertilization, a new organism begins developing, starting as a totipotent zygote. The human sperm cell is haploid, so that its 23 chromosomes can join the 23 chromosomes of the female egg to form a diploid cell with 46 paired chromosomes.

  3. Human fertilization - Wikipedia

    en.wikipedia.org/wiki/Human_fertilization

    The sperm plasma then fuses with the egg's plasma membrane and their nuclei fuse, triggering the sperm head to disconnect from its flagellum as the egg travels down the fallopian tube to reach the uterus. In vitro fertilization (IVF) is a process by which egg cells are fertilized by sperm outside the womb, in vitro.

  4. Female sperm - Wikipedia

    en.wikipedia.org/wiki/Female_sperm

    Creating female sperm was first raised as a possibility in a patent filed in 1991 [4] by injecting a female's cells into a male's testicles, though the patent focused mostly on injecting altered male cells into a male's testes to correct genetic diseases. In 1997, Japanese scientists partially confirmed such techniques by creating chicken ...

  5. Human reproduction - Wikipedia

    en.wikipedia.org/wiki/Human_reproduction

    There are also many methods of assisted reproductive technology, such as in vitro fertilization, where one or more egg cells are retrieved from a woman's ovaries and co-incubated with sperm outside the body. The resulting embryo can then be reinserted into the womb of the woman.

  6. Female reproductive system - Wikipedia

    en.wikipedia.org/wiki/Female_reproductive_system

    If an egg cell meets with sperm on its way to the uterus, a single sperm cell can enter and merge with it, creating a zygote. If no fertilization occurs, menstruation is the process by which the uterine lining is shed as blood, mucus, and tissue. Fertilization usually occurs in the fallopian tubes and marks the beginning of embryogenesis.

  7. Development of the human body - Wikipedia

    en.wikipedia.org/wiki/Development_of_the_human_body

    It is characterised by the process of cell division and cellular differentiation of the embryo that occurs during the early stages of development. In biological terms, human development entails growth from a one-celled zygote to an adult human being. Fertilization occurs when the sperm cell successfully enters and fuses with an egg cell . [2]

  8. L.A. fertility doctor sued over artificially inseminating ...

    www.aol.com/news/l-fertility-doctor-sued-over...

    An electron microscope is used to fertilize an egg cell in Berlin. A Los Angeles doctor has been sued, accused of inseminating the wrong sperm in a woman.

  9. Human reproductive system - Wikipedia

    en.wikipedia.org/wiki/Human_reproductive_system

    The immature spermatozoa or sperm are then sent to the epididymis, where they gain a tail, enabling motility. Each of the original diploid germ cells or primary spermatocytes forms four functional gametes, each forever young. [clarification needed] The production and survival of sperms require a temperature below the normal core body ...