A) \[S,\,{{G}_{2}},\,M\] and \[{{G}_{1}}\]
B) \[{{G}_{1}},\,S,\,{{G}_{2}}\] and M
C) \[S,\,M,\,{{G}_{1}}\] and \[{{G}_{1}}\]
D) \[{{G}_{2}},\,{{G}_{1}},\,M\] and S
Correct Answer: B
Solution :
Howard and Pelc (1953) have divided cell cycle into four phages or stages ie, \[{{G}_{1}},\,S,\,{{G}_{2}}\] and M phase in order. \[{{G}_{1}}\] is the first gap or first growth phase. This phase involves transcripton of 3 types of RNAs ie, rRNA, tRNA and mRNA. S phase is the synthetic phase. The replication of DNA and synthesis of histone proteins occur during this phase. \[{{G}_{2}}\] is the second gap or growth phase. The synthesis of RNA and proteins continue in this phase, which is required for cell growth. M-phase including mitosis and meiosis. The mitosis occurs in somatic cells whereas meiosis in germ cells.
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