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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
Name the hormones involved in regulation of spermatogenesis.
What is oogenesis?
Body breaks up into several fragments and each fragment starts to live as a new individual. This is ______ type of reproduction.
Explain the structure of secondary oocyte.
Describe the process of oogenesis in human female.
The glandular accessory organ which produces the largest proportion of semen is ____________.
Mammalian egg is ____________.
Draw a labeled sketch of a spermatozoan.
Define gametogenesis.
Which of the following correctly describes the secondary oocyte?
Identify the CORRECT sequence of events.
First meiotic division is observed in ____________.
Connective tissue around seminiferous tubules possess endocrine cells called ______.
Fetal sex can be determined by examining cells from amniotic fluid looking for:
In human females, meiosis II is not completed until:
Process of maturation and development of sperms ______.
At the onset of puberty, gonadotropin releasing hormone is secreted by ______.
Complete the analogy with respect to the structure of sperm.
Nebenkern : ‘X’ : : Acrosome is formed from : ‘Y’
