BIOL 1113 Lecture Notes - Lecture 12: Gonadotropin-Releasing Hormone, Seminiferous Tubule, Oogenesis
4 Nov 2016
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Chopped into two and form two copies reproduction. Parthenogenesis: common in some species. (eg. ha(cid:373)(cid:373)er head sharks) it"s a reproductio(cid:374) of a(cid:374) unfertilized egg. Number of offsprings is much higher because each offspring is female and each female can have offspring. Female and male release eggs and sperms to environment external. Spermatogenesis: sperm = dna delivery vehicle, germ cell = sperm or egg producing cells, stem cell. Stem cell stem cell & daughter cell (sperm) Daughter cell: meiosis sperms, produced in testes, seminiferous tubule (200m). Stem cells stay, and daughter cells moves inward. 1000 sperms produced every second: support cells nutrients, hormonal. Male has sertoli and leyding cells: gonadotropin releasing hormone fsh & lh (gonatotropins) Oogenesis: germ cell oogonium primary oocyte stop and wait, 1 egg is matured each menstrual cycle, one copy of genome from four copy, ovary is travelled in oviduct of fallopian tube, where fertilization happens.
