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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
Draw a sectional view of human ovary and label the different follicular stages, ovum and Corpus luteum.
Ovulation is induced by a hormone called ______.
Briefly describe the process of spermatogenesis.
Multiple choice question.
The given figure shows human sperm. Various parts of it are labelled as A, B, C, and D. Which labelled part represents acrosome?
Explain the structure of secondary oocyte.
Give scientific reason.
Older women are more likely to give birth to children with some abnormalities.
The glandular accessory organ which produces the largest proportion of semen is ____________.
Define gametogenesis.
Identify the given image and label its parts marked as a, b, c and d
The secondary oocyte enter into the fallopian tube through the ______.
Calculate the number of sperms and ova produced from 40 primary spermatocytes and 40 primary oocytes.
Identify the correct stages (P - S) in the given diagram of spermatogenesis.
Identify the CORRECT sequence of events.
First meiotic division is observed in ____________.
Find out the CORRECT sequence of spermatogenesis.
In human beings, the largest cell formed during Oogenesis is ______
By which process sperms released from the seminiferous tubules?
During embryonic development, the establishment of polarity along anterior/posterior, dorsal/ventral or medial/lateral axis is called ______.
Which of the following groups of cells in the male gonad, represent haploid cells?
At what stage of life is oogenesis initiated in a human female?
1st polar body is formed at which stage of oogenesis?
After the release of the secondary oocyte, the Graafian follicle develops into ______.
Growth hormone of pituitary is more effective in ______.
Follicular atresia is:
Capacitation refers to changes in the ______.
How many spermatozoa are formed from one secondary spermatocyte?
Meiotic division of the secondary oocyte completed ______.
In our society the women are often blamed for giving birth to daughters. Can you explain why this is not correct?
