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- Stage 3: In this division, the new two daughter cells will further divide into 4 spermatids, having uniquechromosomesthat are approximately half in number to the original spermatogonium.Stage 4: In this stage, the cells move from the lumen of the testes to the epididymis. They get mature and developed into four sperm cells with the growth of microtubules on the centrioles to develop an axoneme. The remaining centrioles elongate and develop into sperm tail.
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- Woah, so that's what spermatogenesis is! Now I totally get the processthank you Chin!
- That's good that you finally know what I'm talking about Jared! Hahaha.
- Now, I’d like to know about Oogenesis, Chin.
- Oogenesis is the type of gametogenesis through which ova, also called the female gametes are formed and the produced female gamete is known as an ovum.
- Stage 3:Each Primary Oocyte starts to undergo meiosis I replicating their DNA, but they are arrested at the first Meiotic Prophase. Occurs Pre-natally.
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- Stage 1: Primordial germ cell undergoes mitosis to produce two Oogonia. These cells are all Diploid. Occurs Pre-natally.
- Stage 2:Each Oogonia also undergoes mitosis to produce two diploid Primary Oocytes. Occurs Pre-natally.
- Stage 5:The secondary oocyte completes meiosis II producing the mature gamete, the Ova, which is haploid. This stage only occurs once fertilization of the secondary oocyte by the sperm has occurred.
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- Stage 4:The meiotic block is removed by the onset of puberty and the first Luteinising Hormone surge. The primary oocyte completes its first meiotic division producing a Secondary oocyte and the first polar body. The Secondary Oocyte enters Meiosis II and is arrested at metaphase II. The secondary oocyte is diploid. The oocyte enlarges due to a increase (x50) in cytoplasmic volume. The oocyte is now 100-150µm.Ovulation occurs at this stage once the first meiotic division has been completed and secondary oocyte formed within the dominant follicle. The exception to this is in the case of the Bitch where ovulation occurs after stage 3 with the Primary Oocyte arrested in prophase I. Occurs after puberty is reached.
- You’re a fantastic teacher, Chin! You simplified and made the lesson understable.
- No problem guys! If you have questions, just ask me, I’m here to help you guys, Goodluck!
- Thank you so much Chin! We're sure that we will get a perfect score tomorrow. Hahaha!
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