The fruit fly has 8 chromosomes (2n) in each cell. During the interphase of mitosis, if the number of chromosomes at G1 phase is 8, what would be the number of chromosomes after the S phase?
4
32
8
16
during the S phase or synthesis phase, DNA synthesis or replication takes place, and the amount of DNA per cell doubles. However, the text explicitly states: 'there is no increase in the chromosome number; if the cell had diploid or 2n number of chromosomes at G1, even after S phase the number of chromosomes remains the same, i.e., 2n' . Therefore, the chromosome number remains 8.
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