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प्रश्न
Give scientific reason.
Older women are more likely to give birth to children with some abnormalities.
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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 syndrome) in offspring.
Hence, older women are more likely to give birth to children with some abnormalities.
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संबंधित प्रश्न
Women are often blamed for producing female children. Consequently, they are ill-treated and ostracized. How will you address this issue scientifically if you were to conduct an awareness programme to highlight the values involved?
Give scientific reason.
There is a menopause when women are 45-50 years old.
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Define gametogenesis.
Formation of ____________ is an indication of the termination of oogenesis.
500 spermatozoa are formed from ____________ secondary spermatocytes.
Which of the following events take place during spermatogenesis?
Find out the CORRECT sequence of spermatogenesis.
Conversion of spermatid into sperm is called as _______.
There is no cell division involved in ______.
Corona radia is made up of ______.
Cavity of graafian follicle is ______.
A reaction of granules content which harden the zona pellucida and ensures sure block to polyspermy is ______.
How many sperms are formed from 4 primary spermatocytes?
Which of the following contains the actual genetic part of a sperm?
The spermatogonia undergo division to produce sperms by the process of spermatogenesis. Choose the correct one with reference to above.
What is the difference between a primary oocyte and a secondary oocyte?
How many spermatozoa are formed from one secondary spermatocyte?
Given below are two statements.
- Statement I: The spermatids are non-motile and non-functional which get transformed into functional spermatozoa by the process of spermiogenesis.
- Statement II: During the process of this change, the spermatids remain held to each other and to Leydig's cells by cytoplasmic bridges.
In light of the above statements, select the correct answer from the option given below.
Sketch and label the process of oogenesis.
