Final answer:
The M checkpoint during metaphase is responsible for stopping cell division if chromosomes are not distributed correctly, preventing nondisjunction and mutations in daughter cells.
Step-by-step explanation:
The checkpoint that will cause division to stop if chromosomes are not properly distributed in the two new cells is the M checkpoint. During the mitotic phase, specifically in metaphase, the M checkpoint ensures that sister chromatids are correctly attached to the spindle fibers and ready for proper separation.
If the chromosomes are not correctly aligned or attached, the checkpoint will prevent the cell from proceeding to anaphase, thereby stopping the division process to prevent nondisjunction, which could lead to mutations in the daughter cells
. Internal control mechanisms at this checkpoint are crucial for maintaining the fidelity of cell division and preventing the distribution of damaged or incorrect genetic material.
The checkpoint that will cause division to stop if chromosomes are not distributed correctly in the two new cells is the M checkpoint.
The M checkpoint, also known as the Spindle Assembly Checkpoint (SAC), occurs during metaphase of mitosis. Its main function is to ensure that all the chromosomes are properly attached to the spindle fibers before they are pulled apart during anaphase.
If the chromosomes are not distributed correctly, the SAC will delay the cell from progressing to anaphase until the issue is resolved. This prevents the formation of daughter cells with an incorrect number of chromosomes.