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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
With the help of diagrammatic representation, explain the process of gametogenesis
Draw a labelled diagram of sperm.
Give scientific reason.
There is a menopause when women are 45-50 years old.
Explain two main process in sexual reproduction.
The process which the sperm undergoes before penetrating the ovum is ____________.
Complete the analogy.
1 primary spermatocyte : 4 spermatozoa :: 1 primary oocyte : ____________.
Identify the labels (i-iv) in the given diagram of the ovum.
Calculate the number of sperms and ova produced from 40 primary spermatocytes and 40 primary oocytes.
Identify the enzyme released by the sperm which has lytic activity.
______ undergoes 2nd meiotic division during spermatogenesis.
The human male gamete is usually about ______ in length.
After ovulation, Graafian follicle regresses into ______.
Which of the following stage of oogenesis forms a membrane called zona pellucida surrounding it?
Identify the wrong statement from the following.
During oogenesis, each diploid cell produces ______.
Which of the following is a primary sex organ of female?
Penetration of the sperm in the ovum is followed by ______
In the process of fertilization, this is true:
How many spermatozoa are formed from one secondary spermatocyte?
Distinguish between human sperm and ovum.
