Oogenesis ovaries

Oogenesis (the process that produces mature ova) begins at puberty in mammalian females (Figure 2). Note that the series of mitoses of oogonial cells occurs only in utero-, all the primary oocytes a female will have ( 500 000 in humans, most of which will die) are present in her ovaries prior to her birth. In utero, each primary oocyte proceeds through the second (of four) phases of meiosis I and waits until puberty and the onset of the cyclical release of FSH... 

Eckelbarger, K.J. and Davis, C.V. (1996) Ultrastructure of the gonad and gametogenesis in the eastern oyster, Crassostrea virginica. I. Ovary and oogenesis. Mar. Biol., 127, 79-87. 

Krentz, A.D. Murphy, MW. Sarver, A.L. Griswold, MD. Bardwell, V.J. Zarkower, D. (2011). DMRTl promotes oogenesis by transcriptional activation of Stra8 in the mammalian fetal ovary. Developmental Biology, Vol.356, No.l, pp. 63-70, ISSN 0012-1606... 

Thelytokous species are also known in phytoseiid mites. The thelytokous reproductive system is presumed to be derived from PGL because the number of thelytokous species is small compared to those with PGL. Comparative morphology of oogenesis and oocyte expansion in the ovary between thelytokous and FCL species will shed new light on the evolutionary flexihility and constraints of PGL in phytoseiid mites. 

Borst DW, Laufer H, Landau M, Chang ES, Hertz WA, Baker FC, Schooley DA (1987) Methyl farnesoate and its role in crustacean reproduction and development. Insect Biochem 17 1123-1127 Browdy CL, Fainzilber M, Tom M, Loya Y, Lubzens E (1990) Vitellin synthesis in relation to oogenesis in in vitro incubated ovaries of Penaeus semisulatus (Crustacea Decapoda, Penaeidae). J Exp Zool (in press)... 

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