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प्रश्न
During reproduction, the chromosome number (2n) reduces to half (n) in the gametes and again the original number (2n) is restored in the offspring. What are the processes through which these events take place?
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उत्तर
During gametogenesis, the chromosomal number is reduced by half and then regained through fertilisation.
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संबंधित प्रश्न
How is 'oogenesis' markedly different from 'spermatogenesis' with respect to the growth till puberty in the humans?
Define spermiogenesis.
What is oogenesis?
Describe the process of oogenesis in human female.
At the time of birth, there are _______________ oocytes in the ovary of a female foetus.
Give scientific reason.
Older women are more likely to give birth to children with some abnormalities.
Describe the structure of the human ovum with a neat labelled diagram.
Give a schematic representation of spermatogenesis and oogenesis in humans.
During spermatogenesis, spermatogonium grows in size to become ______.
The part labelled as ______ contains the energy source that facilitates sperm motility.
Identify the CORRECT sequence of events.
The human male gamete is usually about ______ in length.
In human beings, the largest cell formed during Oogenesis is ______
Conversion of spermatid into sperm is called as _______.
How many autosomes does a human primary spermatocyte have?
Which of the following contains a fluid filled cavity called antrum?
Spermiation is the process of the release of sperm from ______.
Cavity of graafian follicle is ______.
Gray crescent is the area ______.
Besides activating the egg another role of a sperm is to carry ______ to egg.
Layers of an ovum from outside to inside is ______.
Select the correct sequence of stages of spermatogenesis in a human male ______.
The spermatogonia undergo division to produce sperms by the process of spermatogenesis. Choose the correct one with reference to above.
What is the difference between a primary oocyte and a secondary oocyte?
Which type of cell division forms spermatids from the secondary spermatocytes?
In our society the women are often blamed for giving birth to daughters. Can you explain why this is not correct?
Select a correct pair of cells with identical set of chromosomes.
