AP BIOLOGY

CELL DIVISION

THE CELL CYCLE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
At the end of ____ mitosis is complete
A
Metaphase
B
Telophase
C
Anaphase
D
Cytokinesis
Explanation: 

Detailed explanation-1: -Mitosis ends with telophase, or the stage at which the chromosomes reach the poles. The nuclear membrane then reforms, and the chromosomes begin to decondense into their interphase conformations. Telophase is followed by cytokinesis, or the division of the cytoplasm into two daughter cells.

Detailed explanation-2: -During telophase, what remains of the network of spindle fibers is dismantled. Also, around each complete set of chromosomes, a nuclear envelope begins to form and the daughter chromosomes begin to decondense. At this point, the actual process of mitosis is complete.

Detailed explanation-3: -Mitosis results in two identical daughter cells, whereas meiosis results in four sex cells.

Detailed explanation-4: -As telophase moves towards completion, the chromosomes release from their tightly bound structure back into loose chromatin. Telophase is ended by a process known as cytokinesis, which cleaves the cell into two new cells.

Detailed explanation-5: -From the frequency of mitotic phases, defined as indicated in the preceding article (El-Alfy & Leblond, 1987) and corrected for the probability of their occurrence, it was estimated that prophase lasted 4.8 hr; metaphase, 0.2 hr; anaphase, 0.06 hr and telophase, 3.3 hr, while the interphase lasted 5.4 hr.

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