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2. Xenopus egg extract - Wikipedia

   en.wikipedia.org/wiki/Xenopus_egg_extract

   Xenopus egg extract is a lysate that is prepared by crushing the eggs of the African clawed frog Xenopus laevis. It offers a powerful cell-free (or in vitro ) system for studying various cell biological processes, including cell cycle progression, nuclear transport , DNA replication and chromosome segregation .

3. Megan and Morag - Wikipedia

   en.wikipedia.org/wiki/Megan_and_Morag

   Megan and Morag, two domestic sheep, were the first mammals to have been successfully cloned from differentiated cells. [1] They are not to be confused with Dolly the sheep which was the first animal to be successfully cloned from an adult somatic cell [2] or Polly the sheep which was the first cloned and transgenic animal. [3]

4. Oocyte - Wikipedia

   en.wikipedia.org/wiki/Oocyte

   An oocyte (/ ˈ oʊ ə s aɪ t /, oöcyte, or ovocyte is a female gametocyte or germ cell involved in reproduction. In other words, it is an immature ovum, or egg cell. An oocyte is produced in a female fetus in the ovary during female gametogenesis. The female germ cells produce a primordial germ cell (PGC), which then undergoes mitosis ...

5. Parthenogenesis - Wikipedia

   en.wikipedia.org/wiki/Parthenogenesis

   Mature egg cells are produced by mitotic divisions, and these cells directly develop into embryos. In flowering plants, cells of the gametophyte can undergo this process. The offspring produced by apomictic parthenogenesis are full clones of their mother, as in aphids. [citation needed]

6. Zona pellucida - Wikipedia

   en.wikipedia.org/wiki/Zona_pellucida

   The zona pellucida is a translucent matrix of cross-linked glycoprotein filaments that surrounds the mammalian oocyte and is 6.5–20 μm thick depending on the species. Its formation, which depends on a conserved zona pellucida-like (ZP) module that mediates the polymerization of egg coat components, [2] is critical to successful fertilization. [3]

7. Archegonium - Wikipedia

   en.wikipedia.org/wiki/Archegonium

   Gene expression pattern determined by histochemical GUS assays in Physcomitrella patens. In the moss Physcomitrella patens, archegonia are not embedded but are located on top of the leafy gametophore (s. Figure). The Polycomb protein FIE is expressed in the unfertilized egg cell (right) as the blue colour after GUS staining reveals.

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9. Corona radiata (embryology) - Wikipedia

   en.wikipedia.org/wiki/Corona_radiata_(embryology)

   For fertilization to occur, sperm cells rely on hyaluronidase (an enzyme found in the acrosome of spermatozoa) to disperse the corona radiata from the zona pellucida of the secondary (ovulated) oocyte, thus permitting entry into the perivitelline space and allowing contact between the sperm cell and the nucleus of the oocyte.