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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
Women are often blamed for producing female children. Consequently, they are ill-treated and ostracized. How will you address this issue scientifically if you were to conduct an awareness programme to highlight the values involved?
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.
Name the hormones involved in regulation of spermatogenesis.
Draw a labelled diagram of sperm.
Explain the structure of secondary oocyte.
Give scientific reason.
Older women are more likely to give birth to children with some abnormalities.
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At what stage of development are the gametes formed in newborn male and female?
Identify the given image and label its parts marked as a, b, c and d
Expand the acronym.
hCG
The following is the illustration of the sequence of ovarian events (a-i) in a human female.
Identify the figure that illustrates ovulation and mention the stage of oogenesis it represents.
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Formation of ____________ is an indication of the termination of oogenesis.
The human male gamete is usually about ______ in length.
How many functional sperms and how many ova will be formed by a primary spermatocyte and a primary oocyte.
Gray crescent is the area ______.
How many sperms are formed from 4 primary spermatocytes?
In spermatogenesis, reduction division of chromosome occurs during conversion of ______.
1st polar body is formed at which stage of oogenesis?
The prostate gland and seminal vehicle perform the function of ______.
In human females, meiosis II is not completed until:
The spermatogonia undergo division to produce sperms by the process of spermatogenesis. Choose the correct one with reference to above.
The mother germ cells are transformed into a mature follicle through series of steps. Provide the missing steps in the blank boxes.
In spermatogenesis, at the end of the first meiotic division ______ are formed.
Sketch and label the process of oogenesis.
Distinguish between human sperm and ovum.
Match List - I with List - IІ.
| List - I | List - II |
| A. Head | I. Enzymes |
| B. Middle piece | II. Sperm motility |
| C. Acrosome | ΙII. Energy |
| D. Tail | IV. Genetic material |
Choose the correct answer from the options given below:
