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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 diagram of the microscopic structure of human sperm. Label the following parts in it and write their functions:
- Acrosome
- Nucleus
- Middle piece
Define spermiation.
Describe the process of oogenesis in human female.
What is gamete formation?
The male sex hormone testosterone is secreted from ____________.
Give a schematic representation of spermatogenesis and oogenesis in humans.
Identify the given image and label its parts marked as a, b, c and d
During spermatogenesis, spermatogonium grows in size to become ______.
Which of the following enter the maturation phase of oogenesis?
The part labelled as ______ contains the energy source that facilitates sperm motility.
500 spermatozoa are formed from ____________ secondary spermatocytes.
______ undergoes 2nd meiotic division during spermatogenesis.
Draw a labelled diagram of a Graafian Follicle.
Find out the CORRECT sequence of spermatogenesis.
Acrosome reaction in sperm is triggered by ______.
Connective tissue around seminiferous tubules possess endocrine cells called ______.
Cells of corona radiata remain grouped together by ______.
At the time of organogenesis, genes regulate the process at different levels and at different time due to ______.
The head of the epididymis at the head of the testis is called ______.
Which one is released from the ovary?
Growth hormone of pituitary is more effective in ______.
Human milk differs from cow's milk because human milk contains:
Capacitation refers to changes in the ______.
The mother germ cells are transformed into a mature follicle through series of steps. Provide the missing steps in the blank boxes.
Process of maturation and development of sperms ______.
The diagram given below shows the various steps in spermatogenesis.
- Name the parts labelled '1', '2' and '3'.
- Name the process by which part '3' changes to part '4'.
What is spermatogenesis?
Select a correct pair of cells with identical set of chromosomes.
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:
What is the primary purpose of gametogenesis in organisms?
