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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
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.
Male and female gametes are ______.
The fusion of the male and the female gametes is called ______.
Name the hormones involved in regulation of spermatogenesis.
Describe the process of budding in hydra.
Explain the structure of secondary oocyte.
Give scientific reason.
There is a menopause when women are 45-50 years old.
Mammalian egg is ____________.
Mention the differences between spermiogenesis and spermatogenesis.
Which of the following are known as the nourishing cells present in the seminiferous tubules?
Identify the diploid cell.
Identify the labels (i-iv) in the given diagram of the ovum.
Identify the enzyme released by the sperm which has lytic activity.
The immature male germ cells differentiates into ______ at the end of meiosis I.
First meiotic division is observed in ____________.
______ undergoes 2nd meiotic division during spermatogenesis.
After ovulation, Graafian follicle regresses into ______.
There is no cell division involved in ______.
Cells of corona radiata remain grouped together by ______.
A reaction of granules content which harden the zona pellucida and ensures sure block to polyspermy is ______.
Which of the following are called dual gland?
Sperms can be stored for several years in liquid nitrogen with a temperature of ______.
Fetal sex can be determined by examining cells from amniotic fluid looking for:
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.
Name the germinal layers from which the following organs develop: Tongue, heart, sweat glands, vagina, mammary glands, kidney.
What is spermatogenesis?
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:
In which structures does spermatogenesis occur?
