Explain Interphase.
Answers
Explanation:
Interphase :
• The interphase, though caled the resting phase, is the time during which the cell is preparing for division by undergoing both cell growth and DNA replication in an orderly manner • The interphase lasts more than 95% of the duration of cell cycle • Chromosomes are least condensed during interphase
• The interphase is divided into three further phases: G, phase (Gap 1). S phase (Synthesis). G phase (Gap 2)
(1) G1 phase/Post-mitotic gap phase
G1 phase corresponds to the interval between mitosis and initiation of DNA replication.
During G phase, the cell is metabolically active and continuously grows but does not replicate its DNA
(2) S phase
•S or synthesis phase marks the period during which DNA synthesis or replication takes place. During this time the amount of DNA per cell doubles . If the initial amount of DNA is denoted as 2C, then it increases to 4C . However, there is no increase in the chromosome number of the cell had diploid or 2n number of chromosomes at oven after S phase the number of chromosomes remains the same.
. In animal cells, during the S phase, DNA replication begins in the nucleus, and the centriole duplicates in the cytoplasm
(3) G2 phase/Pre-mitotic gap phase:
During the G2 phase, proteins are synthesised in preparation for miosis while cell growth continues.
Cell cycle consist of preparatory phase.