Part II 5. What is the cell cycle? How is it controlled? What is the importance

Question

Part II 5. What is the cell cycle? How is it controlled? What is the importance of the checkpoint between Gi and S? between G2 and M? 6. Hemophilia is inherited as an X-linked exception of it taking a little more time. Her husband John also has normal blood clotting. Their first child was a son who had hemophilia ed recessive trait. Mary has normal blood clotting with the a. What are Mary and John's genotypes? b. What chance is there that their next child will be a hemophilic son? c. A hemophilic daughter?

Explanation / Answer

5) cell cycle is the series of events occur in cell leading to its division and duplication of its DNA to produce two daughter cells.

Cell cycle is regulated by a system of molecules of called cell cycle control systems and these molecules include proteins such as cyclin and Cdks.

Checkpoints are necessary in the regulation of cell cycle to rectify the error or to stop the cell on respective phase of cell cycle from which errors has occurred.

G1 to S Checkpoint controls the commitment of eukaryotic cells to transition of G1 phase to enter to the synthetic phase that is S phase. It is necessary if some protein is mutated that is required in S phase then Checkpoint is required to see whether the cells have each and every normal proteins for the S phase or not.

G2 and M Checkpoint is required to see whether cells have enough duplicated dna and proteins for the division of the cell.

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