First gap phase in cell cycle is

after DNA replication

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after duplication of centrioles

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before DNA replication

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after karyokinesis

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Solution

The correct option is C before DNA replication
Cell cycle includes a non-dividing phase, interphase and a dividing phase, mitotic phase.

Interphase has a long duration and during this phase the cell prepares to divide by undergoing cell growth and DNA replication. Interphase is further divided into $G_{1}$ , S and $G_{2}$ phases. “G” stands for gap and growth happens during this phase.
First gap phase is the $G_{1}$ phase. It is a phase of interphase before DNA replication. After the G $_{1}$ phase, the cell undergoes DNA replication in S phase.

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Q. Chromatin fibers duplication, Genetic material- 4C, Histone Protein Synthesis, membranous organelle duplication, DNA replication, centriole duplication. How many of the above features are associated with the synthesis phase of the cell cycle?

Question 34
Two key events take place, during S-phase in animal cells, DNA replication and duplication of centriole. In which parts of the cell there events occur?

Q. Assertion :Assertion: In plant cells, during S-phase, DNA replication begins in the nucleus, and the centriole duplicates in the cytoplasm. Reason: If the initial amount of DNA is denoted as 2n at

G_{1}

, even after S-phase the amount of DNA remains the same i.e., 2n.

Q. The cell cycle consists of four major phases

G_{1} (g a p) - > S (D N A s y n t h e s i s) - > G_{2} (g a p) - > M (m i t o s i s)

. The yeast mutation cdc8 blocks the cell cycle transition from

G_{2}

phase into M phase. If the DNA content of a normal haploid yeast cell is N, then the DNA content of a haploid cdc8 mutant blocked in

G_{2}

phase is

Q. DNA replication occurs in which phase of cell cycle?

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