( Lecture: Cancer and the Cell Cycle ) What is the correct order of the phases o
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Question
(Lecture: Cancer and the Cell Cycle) What is the correct order of the phases of the cell cycle, beginning immediately following cytokinesis ?
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What happens if the cell has severe chromosomal abnormalities when it reaches the G2/M checkpoint ?
a. Cells do not initiate mitosis until chromosomal defects have been repaired.
b. Cells proceed to mitosis, but after cell division chromosomal abnormalities are repaired.
c. Cells immediately undergo apoptosis.
d. None of the above.
Explanation / Answer
Answer:
The phases of cell cycle are
G1 (cellular contents are duplicate) -----> S (Chromosomes are duplicated) --------> G2 (cell double checks duplicated chromosomes and repairs if necessary) ------> Mitosis (Prophase, metphase, Anaphase, telophase).
a. Cells do not initiate mitosis until chromosomal defects have been repaired.
In G2 phase, the double check of the duplicated chromosomes takes place, if there is any abnormalities, the chromosomes will be repaired.
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