Your SlideShare is downloading. ×
0
Sec.3, cell cycle & cell division
Sec.3, cell cycle & cell division
Sec.3, cell cycle & cell division
Sec.3, cell cycle & cell division
Sec.3, cell cycle & cell division
Sec.3, cell cycle & cell division
Sec.3, cell cycle & cell division
Sec.3, cell cycle & cell division
Sec.3, cell cycle & cell division
Sec.3, cell cycle & cell division
Sec.3, cell cycle & cell division
Sec.3, cell cycle & cell division
Sec.3, cell cycle & cell division
Sec.3, cell cycle & cell division
Sec.3, cell cycle & cell division
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

Sec.3, cell cycle & cell division

479

Published on

The Cell Cycle and Cell Division Section, study well and solve the assessment at the End of that section.

The Cell Cycle and Cell Division Section, study well and solve the assessment at the End of that section.

Published in: Technology, Education
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
479
On Slideshare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
Downloads
33
Comments
0
Likes
0
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. Cell DivisionAll cells are derived from pre- existing cellsNew cells are produced for growth and to replace damaged or old cellsDiffers in prokaryotes (bacteria) and eukaryotes (protists, fungi, plants, & animals) 2
  • 2. Keeping Cells IdenticalThe instructions for making cell parts are encoded in the DNA, so each new cell must get a complete set of the DNA molecules 3
  • 3. DNA Replication DNA must be copied or replicated before cell division, Original DNA DNA is untwisted and strand separate. Every nitrogenous bases on the strands will pair up with its suitable base that floats in the nucleus. Each new cell will then have an identical copy of the DNA Two new, identical DNA strands
  • 4. DNA ShapeDouble helix: 2 spirals wound around each other But joined in the middle
  • 5. What’s Happening in Interphase?What the cell looks like Animal CellWhat’s occurring 6
  • 6. Mitosis 7
  • 7. Chromosomes in Dividing CellsDuplicated chromosomes are called chromatids & are held together by the centromere Called Sister Chromatids
  • 8. Four Mitotic StagesProphaseMetaphaseAnaphaseTelophase 9
  • 9. Mitosis• Prophase: • Chromosomes condense • Nuclear envelope disappears • centrosomes move to opposite sides of the cell • Spindle forms and attaches to centromeres on the chromosomes• Metaphase • Chromosomes lined up on equator of spindle • centrosomes at opposite ends of cell• Anaphase • Centromeres divide: each 2-chromatid chromosome becomes two 1-chromatid chromosomes • Chromosomes pulled to opposite poles by the spindle• Telophase • Chromosomes de-condense • Nuclear envelope reappears • Cytokinesis: the cytoplasm is divided into 2 cells
  • 10. Cytokinesis Means division of the cytoplasm Division of cell into two, identical halves called daughter cells. In plant cells, cell plate forms at the equator to divide cell. In animal cells, cleavage furrow forms to split cell 11
  • 11. CytokinesisCleavage furrow Cell plate in in animal cell animal cell 12
  • 12. Revise and Test YourselfReview ofMitosis 13
  • 13. Name the Mitotic Stages: Interphase Name this?Telophase Prophase Name this? Metaphase Anaphase http://www.cellsalive.com/quiz.htm 14
  • 14. 15

×