bio2ch9 - Chapter Nine Chromosomes the Cell Cycle and Cell...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter Nine Chromosomes, the Cell Cycle, and Cell Division 1) Four Things are Required for Cell Division a) Reproductive signal b) Replication of DNA c) Segregation of the genetic material d) Cytokinesis 2) Prokaryotic Reproduction a) Fission – prokaryotic cell division i) Cell grows, replicates the DNA and divides the cell into two new cells b) Reproductive rates respond to changes in the environment i) E. coli c) Prokaryotes have a single circular chromosome i) Origin of replication ( ori ) ii) Terminus of replication ( ter ) 3) Prokaryotic Cell Division a) The chromosome is attached to the PM at the chromosome ori region b) The DNA replicates and the attachment points separate c) The cell begins to divide d) Two new cells are formed 4) Eukaryotic Cell Division a) Divide by mitosis or meiosis b) Involves reproductive signals, DNA replication, segregation and cytokinesis c) Eukaryotic cells do not divide constantly d) Have many chromosomes e) Have a nucleus i) Division of genetic material is distinct from cytokinesis 5) Eukaryotic Cell Reproduction Involves 3 Steps a) Replication of DNA within the nucleus b) Nuclear division c) Cytokinesis 6) Meiosis a) A second type of cell division b) Produces gametes c) Products of meiosis are not identical d) Generates diversity by shuffling genetic material 7) The Cell Cycle a) Two phases: mitosis and interphase b) Cells spend most of their time in interphase c) Interphase has 3 subphases i) G1 – preparation for DNA replication (1) Cells that do not divide are arrested in the G1 phase ii) S – DNA replication
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
iii) G2 – preparation for mitosis (1) When microtubules are released and are responsible for movement d) Mitosis – nuclear division occurs i) Cytokinesis occurs at the end of mitosis 8) Cyclins and Cyclin-dependent Kinases a) Proteins involved in initiation of the cell cycle b) Cyclin-dependent kinases (Cdk) i) Catalyze the transitions between G1-S and G2-M ii) Activated by binding of another protein called a cyclin (
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 5

bio2ch9 - Chapter Nine Chromosomes the Cell Cycle and Cell...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online