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प्रश्न
Explain two main process in sexual reproduction.
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उत्तर
Two main processes involved in sexual reproduction:
- Gamete formation: In this, meiotic division occurs due to which chromosome number is reduced to half. As a result, haploid gametes are formed (2n → n).
- Fertilization: Haploid male gamete (n) fuses with the haploid female gamete (n) to form a diploid zygote (2n).
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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 ______.
In case of sexual reproduction, newborn show similarities about characters. Explain this statement with suitable examples.
Mammalian egg is ____________.
The Androgen Binding Protein (ABP) is produced by ____________.
Describe the structure of the human ovum with a neat labelled diagram.
Identify the labels (i-iv) in the given diagram of the ovum.
How many autosomes does a human primary spermatocyte have?
After ovulation, Graafian follicle regresses into ______.
Sertoli cells are found in ______.
Corona radia is made up of ______.
Cells of corona radiata remain grouped together by ______.
Which of the following groups of cells in the male gonad, represent haploid cells?
Which of the following contains the actual genetic part of a sperm?
Capacitation refers to changes in the ______.
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?
How many spermatozoa are formed from one secondary spermatocyte?
Answer the following:
How many primary spermatocytes and oocytes are required for the formation of 100 spermatozoa and ova?
Explain Oogenesis with diagram.
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'.
