spermatogenesis
Storyboard Text
- Good morning class! Today let's discuss about gametogenesis. But first, what is gametogenesis? Can you share a brief explanation about it, Olivia?
- Thank you for that Olivia.
- Yes. Based on books that I've read beforehand, gametogenesis is the production of sperm and egg.
- In order to create a sperm, it must be haploid and in order to create a haploid gamete, a cell must go through a process called meiosis. But in humans, it occurs on the seminiferous tubules.
- Spermatogenesis is the process by which male gametes or sperm are created. 200-300 are produced daily in the testes.
- So basically, gametogenesis has two types which are spermatogenesis and oogenesis. But let's talk about spermatogenesis first.
- Spermatogonia enters the process of meiosis and become primary spermatocyte. When cells double in number after first meiotic division, it is called the secondary spermatocyte.
- But before we move on, did you copy everything that was projected on the board?
- Germ cells. These are the cells that'll become gametes. There are germ cells that are found in the testes which is spermatogonium.
- Okay, let's proceed to the sperm cell's precursors.
- Yes miss!
- Yes miss!
- After the meiotic division is ended? What will happen next?
- Correct, but don't get too excited! Since the secondary spermatocyte is continuously migrating, it will form four haploid spermatids. When spermatids are in a correct number of chromosomes, a fully functional sperm is made afterwards.
- Will it become a sperm?
- Oh, I see!
- In addition, they have a single flagellum. A sperm cell uses this to lash back and forth in order to propel the sperm forward.
- That's right! The sperm has nucleus because it contains the haploid genome. It also has an acrosome cap which penetrates the layers of the ovum so that the sperm can get inside.
- I guess everyone of you knows what the sperm looks like right?
- Yes! It is like a tadpole, I guess?
- That's all for today class! Let's tackle oogenesis next meeting. I have an appointment to attend this morning. See you all tomorrow!
- Thank you miss! Good bye!
- Thanks for today miss! I learned a lot today.
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