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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
Draw a sectional view of human ovary and label the different follicular stages, ovum and Corpus luteum.
Explain the development of a secondary oocyte (ovum) in a human female from the embryonic stage upto its ovulation. Name the hormones involved in this process.
The process of release of the ovum from a mature follicle is called ______.
Identify True/False statement. Correct the false statement to make it true.
Oogenesis takes place in the corpus luteum.
Name the functions - Acrosome of sperm.
Implantation of embryo occurs in ______.
Which precautions will you follow to maintain the reproductive health?
Explain two main process in sexual reproduction.
Complete the analogy.
1 primary spermatocyte : 4 spermatozoa :: 1 primary oocyte : ____________.
Extrusion of second polar body from egg nucleus occurs ______.
Acrosome reaction in sperm is triggered by ______.
Which among the following has 23 chromosomes?
The nutritive cells found in seminiferous tubules are ______.
The principal tail piece of human sperm shows the microtubular arrangement of ______.
Penetration of the sperm in the ovum is followed by ______
The mother germ cells are transformed into a mature follicle through series of steps. Provide the missing steps in the blank boxes.
Which type of cell division forms spermatids from the secondary spermatocytes?
The process of gametogenesis is initiated by ______ and ______ hormones respectively.
