Cells divide during mitosis and cytokinesis .
Post on 13-Jan-2016
45 Views
Preview:
DESCRIPTION
Transcript
5.2 Mitosis and Cytokinesis
Chromosomes condense at the start of mitosis.
• DNA wraps around proteins (histones) that condense it.
DNA doublehelix
DNA andhistones
Chromatin SupercoiledDNA
5.2 Mitosis and Cytokinesis
• Chromatin- DNA plus proteins.
• Chromatid- One half of a duplicated chromosome.
• Centromere- Hold together Sister chromatids.
• Telomeres- protect DNA and do not include genes.
Condensed, duplicated chromosome
chromatid
telomere
centromere
telomere
5.2 Mitosis and Cytokinesis
Parent cell
centrioles
spindle fibers
centrosome
nucleus withDNA
Interphase• prepares the cell to
divide• DNA is duplicated.
Mitosis and Cytokinesis produce two genetically identical daughter cells.
5.2 Mitosis and Cytokinesis
Mitosis divides the cell’s nucleus in four phases.
PMATPROPHASE
METAPHASE ANAPHASE
TELOPHASE
5.2 Mitosis and Cytokinesis
divides cytoplasm into two cells– In animal cells, the
membrane pinches closed.
– In plant cells, a cell plate forms.
5.2 Mitosis and Cytokinesis
Mitosis Overview
• Prophase- Chromosomes PAIR• Metaphase- Chromosomes line up in the MIDDLE• Anaphase- Sister chromatids are pulled AWAY• Telophase- TWO new nuclei are formed
PMAT
top related