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प्रश्न
If newborns are produced at the age of menopause, they may be with some abnormalities. Why?
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
In case of sexual reproduction, newborn show similarities about characters. Explain this statement with suitable examples.
Sex organs produce gametes which are diploid.
Answer the following type of question Assertion (A) and Reason (R).
(A) - Head of the sperm consists of acrosome and mitochondria.
(R) - Acrosome contains spiral rows of mitochondria.
Mention the differences between spermiogenesis and spermatogenesis.
Define gametogenesis.
The secondary oocyte enter into the fallopian tube through the ______.
Identify the labels (i-iv) in the given diagram of the ovum.
Which is the correct order of steps occurring during spermatogenesis?
Select the pair of cells which does not divide further by mitosis.
By which process sperms released from the seminiferous tubules?
The immature male germ cell undergo division to produce sperms by the process of spermatogenesis.
Choose the correct one with reference to the above.
The cell which undergoes meiosis I during spermatogenesis is the ______.
Gray crescent is the area ______.
Besides activating the egg another role of a sperm is to carry ______ to egg.
The nutritive cells found in seminiferous tubules are ______.
The process of release of spermatozoa from Sertoli cells into cavity of the seminiferous tubules is called ______.
In the process of fertilization, this is true:
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.
Distinguish between human sperm and ovum.
