What is cell cycle. Who had proposed it and important postulations
Answers
- The cell cycle is an ordered series of events involving cell growth and cell division that produces two new daughter cells.
Answer:
The cell cycle is a series of activities taking place orderly in a eukaryotic which involves both cell growth and division so as to form two daughter cells. Each cell cycle is divided into four divisions:
G1 phase: Cell grows in preparation for division
S phase: DNA duplication
G2 phase: Checking of DNA duplication
M phase: Mitotic division
Cell cycle was proposed by Walther Flemming in Kiel, Germany. He was the first person to discover the process of cell division. Initially, he discovered chromatin and later on how the nucleus splits into two nuclei and the cell as a whole splitting into two. These processes were later named as mitosis and cytokinesis.
Postulations:
• The cell cycles differ with the type of cells like skin, bone, heart, or nerve cells.
• The cell cycles of all eukaryotic cells undergo four phases – the G1, S, G2, and the M phase.
• The frequency at which each cycle occurs and the total length required to complete varies with the type of the cell. The skin cells undergo constant division to compensate for any changes occurring due to injuries.
• Cell cycles of prokaryotic organisms are simpler and undergo binary fission because they lack a nucleus.