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If the somatic cell has a chromosome number of 40, what would be the expected chromosomal number in the cells of the seminiferous tubules?
40
20
10
40 and 20
Answers (1)
The somatic cells in humans have a diploid chromosome number of 46, which means they have 23 pairs of chromosomes. However, cells in the seminiferous tubules of the testes undergo a special type of cell division called meiosis to produce sperm cells.
During meiosis, the chromosome number is reduced by half. In the first round of division (meiosis I), the homologous pairs of chromosomes separate, resulting in two cells, each with 23 chromosomes. These cells are haploid. In the second round of division (meiosis II), the sister chromatids of each chromosome separate, resulting in four cells, each with 23 individual chromosomes.
Therefore, the cells of the seminiferous tubules, specifically the sperm cells, have a haploid chromosomal number of 23, which is half of the somatic cell's chromosome number. However, it's important to note that the cells in the seminiferous tubules go through meiosis continuously, so not all cells will have the same chromosomal number at any given time.
Hence, the expected chromosomal number in the cells of the seminiferous tubules would be a combination of both 40 (diploid) and 20 (haploid), depending on the stage of meiosis. This is because meiosis results in the halving of the chromosome number. Hence, the correct answer is option 4.
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