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प्रश्न
If newborns are produced at the age of menopause, they may be with some abnormalities. Why?
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उत्तर
- A female has millions of oocytes at the time of birth and new ova are not formed thereafter.
- Menopause occurs at approximately 40-50 years of age and hence fewer numbers of eggs are present with reduced fertility since the oocytes have aged.
- Their ability to divide diminishes and they may not be able to complete meiotic division properly.
- Fertilization of such oocytes may result in the production of genetic abnormalities (like Down’s syndrome) in offsprings.
Hence, if newborns are produced at the age of menopause, they may be with some abnormalities.
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संबंधित प्रश्न
Draw a diagram of the microscopic structure of human sperm. Label the following parts in it and write their functions:
- Acrosome
- Nucleus
- Middle piece
Fill in the blank.
Implantation of embryo occurs in ------
Describe the process of spermatogenesis with the help of diagram.
At what stage of development are the gametes formed in newborn male and female?
Which of the following enter the maturation phase of oogenesis?
Which of the following correctly describes the secondary oocyte?
Select the correct sequence of oogenesis.
The immature male germ cells differentiates into ______ at the end of meiosis I.
The human male gamete is usually about ______ in length.
How many sperms are formed from a secondary spermatocyte?
Acrosome reaction in sperm is triggered by ______.
It The cell division in secondary oocyte is suspended at ______.
Corona radia is made up of ______.
How many functional sperms and how many ova will be formed by a primary spermatocyte and a primary oocyte.
Besides activating the egg another role of a sperm is to carry ______ to egg.
Layers of an ovum from outside to inside is ______.
Mark the odd one.
Follicular atresia is:
In human females, meiosis II is not completed until:
Draw a neat and labelled diagram of spermatogenesis.
