Oogenesis 0.0 / 5 ? BiologyAnatomyUniversityAll boards Created by: SaoirseCreated on: 22-12-14 10:50 During fetal development meiosis 1 begins but stops in prophase Oogonium (2n) >>>> Primary oocyte (2n) 1 of 6 After puberty, primary oocytes complete meiosis 1, which produces a secondary oocyte and a first polar body which may or may not divide again Primary oocyte (2n) >>>> secondary oocyte (n) + first polar body (n) 2 of 6 Secondary oocyte begins meiosis 2 but stops in metaphase Secondary oocyte 3 of 6 A secondary oocyte and first polar body are now ovulated Secondary oocyte 4 of 6 After fertilisation, meiosis 2 resumes. Oocyte splits into an ovum and second polar body Sperm (n) + Secondary oocyte (n) >>>> Ovum (n) + second polar body (n) 5 of 6 Nuclei of sperm and ovum unite, forming a diploid zygote Ovum (n) + sperm (n) >>>> zygote (2n) 6 of 6
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