In the context of your question about cell division and healing a cut on your hand, the relevant part of the cell cycle would be during the M phase (Mitosis), where the actual cell division occurs.
However, since you are asking about the formation of new cells after the initial injury and considering the options provided, we can make some clarifications:
- The cells that will be replicating to heal the cut will be in different phases depending on the timing of the process.
- After the S phase (where DNA is duplicated), each cell will contain 46 pairs of chromosomes (or 92 total chromosomes in the duplicated state), but it is important to note that these pairs are not immediately available to form new cells until they successfully complete mitosis.
However, given the choices:
- a: G1 Checkpoint- checking cell size and for enough proteins, 46 pairs of chromosomes - This is before DNA is replicated.
- b: G2 Checkpoint- checking cell size and DNA replication, 46 pairs of chromosomes - This is after DNA replication, and yes, the cell would have 46 pairs.
- c: M-complete cell division, 23 pairs of chromosomes - This indicates the final phase (after division).
- d: S- duplication of the DNA, 23 pairs chromosomes - This is also incorrect, as it refers to DNA duplication where the number of pairs doubles.
For healing the cut, if the new formed cells are undergoing mitosis, they would have completed the cycle with 46 pairs of chromosomes. Therefore, the best option from your choices aligns with b:
b G2 Checkpoint- checking cell size and DNA replication, 46 pairs of chromosomes.
After mitosis, new cells will ultimately have 23 pairs of chromosomes (46 total) that are produced as a result of cell division.
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