بسم الله
histology
بداية جمعت شرايح الهستولوجي المهمة من عدد من محاضرات د مروة جعفر جامعة النيلين
ولسى الملف حيتم التعديل عليه
دا spacial histo
ولسى الملف حيتم التعديل عليه
دا spacial histo
تجربة
Sexual reproduction occurs when female and male gametes (oocyte and spermatozoon, respectively)
unite at fertilization. Gametes are direct descendants of primordial germ cells, which are
first observed in the wall of the yolk sac at week 4 of embryonic development and subsequently
migrate into the future gonad region. Gametes are produced by gametogenesis (called oogenesis
in the female and spermatogenesis in the male). Gametogenesis employs a specialized
process of cell division, meiosis, which uniquely distributes chromosomes among gametes
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