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Question
During a complete process of oogenesis from a single primary oocyte, how many ovum and polar bodies are formed?
During a complete process of oogenesis from a single primary oocyte, how many ovum and polar bodies are formed?
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Solution
The correct option is B 1 ovum and 3 polar bodies
Oogenesis is a type of gametogenesis (formation of gametes) during which a female gamete (ovum) is produced via multiple divisions.
Primordial germ cells (egg germ cells; 2N) firstly undergo mitosis to form diploid primary oocyte (2N) which on first reductional division forms secondary oocyte (N) and the first polar body.
The first polar body may divide to form two second polar bodies. On further division(meiosis II), secondary oocytes again form a mature ovum and one polar body. Therefore, one ovum and three polar bodies are formed after one oogenesis cycle.
Oogenesis is a type of gametogenesis (formation of gametes) during which a female gamete (ovum) is produced via multiple divisions.
Primordial germ cells (egg germ cells; 2N) firstly undergo mitosis to form diploid primary oocyte (2N) which on first reductional division forms secondary oocyte (N) and the first polar body.
The first polar body may divide to form two second polar bodies. On further division(meiosis II), secondary oocytes again form a mature ovum and one polar body. Therefore, one ovum and three polar bodies are formed after one oogenesis cycle.
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(a) About 300 million spermatozoa may be present in a human male ejaculation at one time. Calculate how many spermatocytes will be involved to produce this number of spermatozoa.Join BYJU'S Learning Program
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