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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
Name the hormones involved in regulation of spermatogenesis.
Mention the differences between spermiogenesis and spermatogenesis.
Draw a labeled sketch of a spermatozoan.
500 spermatozoa are formed from ____________ secondary spermatocytes.
Draw a labelled diagram of a Graafian Follicle.
Select the pair of cells which does not divide further by mitosis.
Conversion of spermatid into sperm is called as _______.
After ovulation, Graafian follicle regresses into ______.
There is no cell division involved in ______.
Cavity of graafian follicle is ______.
Cells of corona radiata remain grouped together by ______.
Which one is released from the ovary?
Head of epididymis is called as ______.
The region of the root tip whose cells undergo rapid elongation and enlargement and are responsible for the growth of the root in length is called the:
Follicular atresia is:
Capacitation refers to changes in the ______.
In spermatogenesis, at the end of the first meiotic division ______ are formed.
Match List - I with List - IІ.
| List - I | List - II |
| A. Head | I. Enzymes |
| B. Middle piece | II. Sperm motility |
| C. Acrosome | ΙII. Energy |
| D. Tail | IV. Genetic material |
Choose the correct answer from the options given below:
What are the two main types of gametogenesis based on the organ in which they occur?
