Expand G1S and G2M

1.	Expand G1S and G2M
Answer» The\xa0S phase\xa0of a cell cycle occurs\xa0during\xa0interphase, before mitosis or meiosis, and is responsible for the synthesis or replication of DNA. In this way, the genetic material of a cell is doubled before it enters mitosis or meiosis, allowing there to be enough DNA to be split into daughter cells.\xa0Between G1 and S phase, three DNA damage checkpoints occur to ensure proper growth and synthesis of DNA prior to cell division. Damaged DNA during\xa0G1, before entry into\xa0S phase, and during\xa0S phase\xa0result in the expression of ATM/R protein.\xa0Interphase is divided into the first growth (G1), Synthesis (S), and the second growth (G2) phases (figure 1). The growth phases are, as you may have suspected, for the growth of the cell, during the synthesis phase the DNA replication occurs in preparation for the second growth phase.

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