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Select the correct option of haploid cells from the following groups:
- a)Primary oocyte, Secondary oocyte, Spermatid
- b)Secondary spermatocyte, First polar body, Ovum
- c)Spermatogonia, Primary spermatocyte, Spermatid
- d)Primary spermatocyte, Secondary spermatocyte, Second polar body
Correct answer is option 'B'. Can you explain this answer?
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Select the correct option of haploid cells from the following groups:a...
Haploid Cells in Meiosis
In meiosis, the process of cell division that produces gametes, haploid cells are formed through two rounds of division. Each round of division involves a reduction in the number of chromosomes from diploid (2n) to haploid (n).
Option B is the correct answer because all three cells listed are haploid:
- Secondary spermatocyte: This cell is formed during meiosis I in the male reproductive system. It is the result of the division of a primary spermatocyte and contains 23 chromosomes (n) instead of 46 (2n).
- First polar body: This cell is formed during meiosis I in the female reproductive system. It is the result of the division of a primary oocyte and contains 23 chromosomes (n).
- Ovum: This cell is formed during meiosis II in the female reproductive system. It is the result of the division of a secondary oocyte and contains 23 chromosomes (n).
Options A, C, and D are incorrect because they include cells that are not haploid:
- Primary oocyte and secondary oocyte: These cells are both diploid (2n) because they have not yet undergone meiosis I.
- Spermatogonia and primary spermatocyte: These cells are both diploid (2n) because they are in the early stages of meiosis in the male reproductive system.
- Spermatid, secondary spermatocyte, and second polar body: These cells are haploid, but they are not all present in the same stage of meiosis. Spermatids are formed during meiosis II in the male reproductive system, while secondary spermatocytes and second polar bodies are formed during meiosis I in the male and female reproductive systems, respectively.
In meiosis, the process of cell division that produces gametes, haploid cells are formed through two rounds of division. Each round of division involves a reduction in the number of chromosomes from diploid (2n) to haploid (n).
Option B is the correct answer because all three cells listed are haploid:
- Secondary spermatocyte: This cell is formed during meiosis I in the male reproductive system. It is the result of the division of a primary spermatocyte and contains 23 chromosomes (n) instead of 46 (2n).
- First polar body: This cell is formed during meiosis I in the female reproductive system. It is the result of the division of a primary oocyte and contains 23 chromosomes (n).
- Ovum: This cell is formed during meiosis II in the female reproductive system. It is the result of the division of a secondary oocyte and contains 23 chromosomes (n).
Options A, C, and D are incorrect because they include cells that are not haploid:
- Primary oocyte and secondary oocyte: These cells are both diploid (2n) because they have not yet undergone meiosis I.
- Spermatogonia and primary spermatocyte: These cells are both diploid (2n) because they are in the early stages of meiosis in the male reproductive system.
- Spermatid, secondary spermatocyte, and second polar body: These cells are haploid, but they are not all present in the same stage of meiosis. Spermatids are formed during meiosis II in the male reproductive system, while secondary spermatocytes and second polar bodies are formed during meiosis I in the male and female reproductive systems, respectively.
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Select the correct option of haploid cells from the following groups:a...
- Primary and secondary spermatocytes are formed through the process of spermatocytogenesis. Primary spermatocytes are diploid (2N) cells. After meiosis I, two secondary spermatocytes are formed. Secondary spermatocytes are haploid (N) cells that contain half the number of chromosomes.
- During meiotic cell-cycle progression, unequal divisions take place, resulting in a large oocyte and two diminutive polar bodies. Both these polar bodies are haploid in nature.
- A secondary oocyte only undergoes the second meiotic cell division to form a haploid ovum if it is fertilisedby a sperm. The one egg cell that results from meiosis contains most of the cytoplasm, nutrients, and organelles. It is a haploid in nature.
Hence, the Correct Answer is B
NCERT Reference: Page no. 47, 48 of topic “3.3 Gametogenesis” and page no. 52 of “3.5 Fertilisation and implantation” of chapter 3 of NCERT.
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Select the correct option of haploid cells from the following groups:a)Primary oocyte, Secondary oocyte, Spermatidb)Secondary spermatocyte, First polar body, Ovumc)Spermatogonia, Primary spermatocyte, Spermatidd)Primary spermatocyte, Secondary spermatocyte, Second polar bodyCorrect answer is option 'B'. Can you explain this answer?
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