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Title: DNA Replication
Description: In this chapter we talk about the DNA replication, happening in our body: in our cells: in our nucleus.
Description: In this chapter we talk about the DNA replication, happening in our body: in our cells: in our nucleus.
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Cell Biology 201
Ch 17DNA Replication
Dr
...
Zubair Yousaf
Why Cells Divide? (1)
➢ Fundamental Feature of organisms ; Grow & Reproduce
➢ Cells cannot continue to enlarge indefinitely
➢ Cell growth is generally accompanied by cell division
➢ For single-celled organisms, cell division increases the
total number of individuals in a population
...
Why Cells Divide? (2)
• In Just One Second about 2 million stem cells in
bone marrow divide to maintain a constant
number of red blood cells in the body
...
• A fertilized animal egg typically undergoes
many divisions without the growth of its
cells
...
Link of original research-https://www
...
com/articles/s41586-022-05246-3
The Prokaryotic Cell Cycle
The Eukaryotic Cell Cycle
Division of Nucleus and Cytoplasm
Phases of Cell Cycle
• S and M phases lengths tend to be similar for different mammalian cells
• Usually G1 phase lasts 8–10 hours, with exceptions of few minutes to
years
•
During G1, a major “decision” is made as to whether and when the cell
is to divide again
...
• Complete Exit from cell cycle, undergo terminal differentiation, never to
divide again; Most of the Nerve Cells Feature
•
G2 is shorter than G1 and more uniform in duration, usually lasting 4–6
hours
Title: DNA Replication
Description: In this chapter we talk about the DNA replication, happening in our body: in our cells: in our nucleus.
Description: In this chapter we talk about the DNA replication, happening in our body: in our cells: in our nucleus.