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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
The male sex hormone testosterone is secreted from ____________.
Describe the structure of the human ovum with a neat labelled diagram.
Identify the diploid cell.
Formation of ____________ is an indication of the termination of oogenesis.
Which of the following correctly describes the secondary oocyte?
Calculate the number of sperms and ova produced from 40 primary spermatocytes and 40 primary oocytes.
First meiotic division is observed in ____________.
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.
Head of epididymis is called as ______.
Penetration of the sperm in the ovum is followed by ______
What does the figure represent?
3-celled male gamete develops in:
If for a species 2n = 16, then during Ist prophase and IInd prophase of the meiotic division of a cell, how many tetrads and diads will be formed:
Which of the following cells during gametogenesis is normally diploid?
Capacitation refers to changes in the ______.
The spermatogonia undergo division to produce sperms by the process of spermatogenesis. Choose the correct one with reference to above.
Which type of cell division forms spermatids from the secondary spermatocytes?
Meiotic division of the secondary oocyte completed ______.
