Key Difference – Secondary Oocyte vs Ovum
Gametesare maturehaploidsex cells which are capable offertilizationduringsexual reproduction。The process which produces gametes is known as gametogenesis.减数分裂is the main event that occurs in gametogenesis. Haploid gametes are produced from parent diploid gametocytes by meiosis. Gametogenesis differs in males and females. In humans, male gametes are known asspermsand the process which produces sperms is known as精子发生。Female gametes are known as egg cells or ova and the process that produces mature ova is known asoogenesis。卵子发生比精子发生是复杂的过程。卵子发生甚至在雌性婴儿出生之前就开始了。卵母细胞是雌性配子细胞,会发生减数分裂以形成OVA。它们是未成熟的二倍体细胞ovaryof the females. Oocytes divide by two meiotic cell divisions to form mature ova. When an oocyte begins to mature and divide, it is known as primary oocyte. Primary oocyte is subjected to first meiotic division and produces secondary oocyte. Secondary oocyte is an immature female gamete produced after the completion ofmeiosis I。Second phase of meiosis is paused until the secondary oocyte is fertilized with a sperm. Soon after fertilization, secondary oocyte undergoes meiosis II and produces mature egg cell calledovum。Ovum nucleus fuses with sperm nucleus and produces thezygote, which can develop into an individual. The key difference between secondary oocyte and ovum is thatsecondary oocyte is an immature egg cellthat is formed after第一个减数分裂师whileovum is the mature gametethat is formed afterthe second meiosis division.
内容
1.Overview and Key Difference
2.什么是次级卵母细胞
3.What is Ovum
4.次级卵母细胞和卵子之间的相似性
5.并排比较 - 次级卵母细胞与卵形的表格形式
6。概括
什么是次级卵母细胞?
Secondary oocyte is an immature female gamete produced from primary oocyte during oogenesis. When oogenesis begins, primary oocytes which have 46染色体, undergo first meiotic cell division. It results in secondary oocytes which contain a haploid number of chromosomes (23 chromosomes). Secondary oocyte undergoes second meiotic cell division and produces mature female gamete, which is the ovum. Second meiosis is arrested till the secondary oocyte is fertilized with a sperm. Soon after the fertilization, meiosis completes and a mature egg cell is produced.
次级卵母细胞是一个较大的细胞,其中包含一个大细胞细胞质, nutrients, and organelles. Once it is fertilized, it produces one mature large cell called ovum and a polar body. During oogenesis, the cytoplasm divides unequally. Most of the cytoplasm comes into the secondary oocyte and then to the ovum. It is important to have cytoplasm since zygote receives cytoplasm only from the egg cell.
What is an Ovum?
卵子成熟的通用电气rm cell of a female which is ready to fuse with a male germ cell. It is the final result of oogenesis. Ovum contains a haploid number of chromosomes and it can produce a new organism, which has the diploid number of chromosomes after fusing with the haploid sperm cell.
人卵是一个较大的细胞,它由protoplasm其中包含一些蛋黄。原生质被封闭在由两层组成的细胞壁中:内层(Zona pellucida)和外层(卵黄膜)。在卵子内部,有一个较大的核。
What are the Similarities Between Secondary Oocyte and Ovum?
- Secondary oocyte and ovum contain 23 chromosomes.
- Both cells are haploid.
- 这两个细胞均在女性生殖器官内部产生。
- Both cells are products of female gametogenesis.
次级卵母细胞和卵子有什么区别?
次级卵母细胞与卵子 |
|
Secondary oocyte is an immature female gamete which results from the first meiotic division of primary oocyte. | Ovum is the complete female germ cell which has attained the maturity to fuse with male germ cell. |
减数分裂I和II的完成 | |
Secondary oocyte has completed only one phase of meiosis | Ovum完成了减数分裂的第二阶段。 |
Maturity | |
Secondary oocyte is an immature cell. | 卵是一个成熟的细胞。 |
形成 | |
Secondary oocyte is derived from the primary oocyte. | 卵来自次生卵母细胞。 |
Ability to Divide | |
Secondary oocyte can undergo meiosis. | 卵子不能进行减数分裂。 |
概括– Secondary Oocyte vs Ovum
卵子发生是形成成熟的雌性生殖细胞的过程,称为卵子。卵子发生有两个主要的细胞分裂。减数分裂I和减数分裂II。原发性卵母细胞开始卵子发生,并分为二次卵母细胞和极性体。次级卵母细胞是未成熟的女配子,尚未达到与雄性生殖细胞融合的适当成熟度。次级卵母细胞经历第二减数症分裂,并产生一个名为Ovum和极性体的成熟雌性生殖细胞。卵是卵子发生的最终产物。它足够成熟,可以与雄性生殖细胞核融合并产生合子。次级卵母细胞是卵子发生的中间产物,而卵子是卵子发生的最终完整产物。这是次级卵母细胞和卵子之间的差异。 Secondary oocytes and ova are largest cells found in female bodies.
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参考:
1.“配子发生。”。维基百科。Wikimedia基金会,2017年7月16日。Available here.2017年7月30日。
2.“卵子 - 人体解剖学”。theodora.com。N.P.,N.D。网络。Available here。2017年7月30日。
Image Courtesy:
1.亨利·范迪克·卡特(Henry Vandyke Carter)的“灰色5” - 亨利·格雷(Henry Gray)(1918)人体解剖学,由mysid进行了修改。(公共领域)通过Commons Wikimedia
2. “Ovum in Cumulus Oophorus, Human Ovary (6264021209)” By Ed Uthman from Houston, TX, USA – Ovum in Cumulus Oophorus, Human OvaryUploaded by CFCF(CC由2.0)viaCommons Wikimedia
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