If somatic chromosomes number is 40. What shall be chromosomal number in the cell of seminiferous tubules - [AFMC 94]a)40b)20c)10d)40 and 20Correct answer is option 'D'. Can you explain this answer?

Question

Answer

Yes because in seminiferous tubule we found  spermetagonia which is a diploid cell and by mitosis  in this cell we got primary spermetocyte which is also a diploid cell and by meiosis 1first in this cell we got 2 secondary spermetocytes which are haploid in nature.so 40 and 20 both are present in seminiferous tubule

Answer

The chromosomal number in the cell of seminiferous tubules is 40 and 20.

Explanation:
The somatic chromosomes are the chromosomes found in all non-reproductive cells of an organism. These chromosomes exist in pairs, with two copies of each chromosome, one inherited from each parent. The total number of somatic chromosomes is called the somatic chromosome number.

In this case, the somatic chromosome number is given as 40. This means that there are 40 pairs of chromosomes in the somatic cells of this organism.

The seminiferous tubules are part of the male reproductive system, specifically the testes. These tubules are responsible for the production of sperm cells through a process called spermatogenesis.

During spermatogenesis, a diploid cell called a spermatogonium undergoes meiosis to produce haploid sperm cells. Meiosis is a cell division process that reduces the chromosome number in half, resulting in the formation of gametes (sperm or egg cells) with half the number of chromosomes as the parent cell.

In this case, meiosis in the seminiferous tubules would result in the production of haploid sperm cells with a chromosomal number of 20. This is because meiosis consists of two divisions, meiosis I and meiosis II, which each result in the separation of homologous chromosomes and sister chromatids, respectively.

Therefore, the chromosomal number in the cell of seminiferous tubules is 20.

However, it is important to note that the seminiferous tubules also contain other types of cells involved in spermatogenesis, such as Sertoli cells and Leydig cells. These cells are not directly involved in the production of sperm cells and may have a different chromosomal number.

In summary, the chromosomal number in the cell of seminiferous tubules is 40 and 20. The somatic chromosome number is 40, while the chromosomal number in the sperm cells produced in the seminiferous tubules is 20.

Answer

Explanation:
The chromosomal number in a somatic cell is referred to as the diploid number (2n), which represents the total number of chromosomes in a cell. In this case, the somatic chromosome number is given as 40.
The cells in the seminiferous tubules of the testes are called germ cells, which undergo a special type of cell division called meiosis to produce sperm cells. Meiosis involves two rounds of cell division, resulting in the formation of haploid cells with half the number of chromosomes as the parent cell.
Steps of Meiosis:
1. In the first round of meiosis, called meiosis I, the diploid cell undergoes DNA replication, followed by two divisions resulting in the formation of two haploid cells called secondary spermatocytes. Each secondary spermatocyte contains half the number of chromosomes as the parent cell (20 in this case).
2. In the second round of meiosis, called meiosis II, each secondary spermatocyte divides again to form two spermatids. The spermatids are still haploid and contain the same number of chromosomes as the secondary spermatocytes (20 chromosomes).
3. Finally, the spermatids undergo a process called spermiogenesis, where they differentiate into mature sperm cells called spermatozoa. The spermatozoa are also haploid and contain 20 chromosomes.
Therefore, the chromosomal number in the cells of the seminiferous tubules is 20, which is half the number of chromosomes found in somatic cells. So, the correct answer is D. (40 and 20).

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