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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
Give the name and function for ‘A’ and ‘B’ from the diagram given below
Male and female gametes are ______.
Ovulation is induced by a hormone called ______.
Briefly describe the process of spermatogenesis.
Fill in the blank.
Implantation of embryo occurs in ------
Mammalian egg is ____________.
The secondary oocyte enter into the fallopian tube through the ______.
Which of the following is diploid?
Which of the following events take place during spermatogenesis?
Which of the following contains a fluid filled cavity called antrum?
Cells of corona radiata remain grouped together by ______.
Besides activating the egg another role of a sperm is to carry ______ to egg.
Which one is released from the ovary?
In oogenesis haploid egg is fertilised by sperm at which stage?
Layers of an ovum from outside to inside is ______.
Which of the following cells during gametogenesis is normally diploid?
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.
Explain Oogenesis with diagram.
What is spermatogenesis?
