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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
______ type of reproduction occurs without fusion of gametes.
At the time of birth, there are _______________ oocytes in the ovary of a female foetus.
Mammalian egg is ____________.
The Androgen Binding Protein (ABP) is produced by ____________.
Expand the acronym.
LH
500 spermatozoa are formed from ____________ secondary spermatocytes.
Calculate the number of sperms and ova produced from 40 primary spermatocytes and 40 primary oocytes.
Which is the correct order of steps occurring during spermatogenesis?
The immature male germ cells differentiates into ______ at the end of meiosis I.
Four primary spermatocytes give rise to ______.
______ undergoes 2nd meiotic division during spermatogenesis.
Middle piece of mammalian sperm possesses ______.
Which of the following stage of oogenesis forms a membrane called zona pellucida surrounding it?
Which of the following contains a fluid filled cavity called antrum?
Corona radia is made up of ______.
Human milk differs from cow's milk because human milk contains:
What is spermatogenesis?
Select a correct pair of cells with identical set of chromosomes.
During oogenesis the meiotic division is arrested at ______ before fertilization.
