Post on 01-Jan-2016
description
• Cell Mitosis Lesson Objectives
• ∙We will understand the importance of
• cell reproduction (mitosis). ∙We will learn about all the stages of
• mitosis.
Why Mitosis?
• Growth. The number of cells within an organism increases by mitosis and this is the way multicellular organisms grow. ∙
• Cell Replacement. Cells are constantly dying and being replaced by new ones. The new cells must be exact copies of the cells being replaced. ∙
• Regeneration. Some animals can regenerate parts of their body, and production of new cells are achieved by mitosis.
• Red blood cells have short live spans of about 4 months and need to be replaced constantly by mitosis.
Eukaryotes vs Prokaryotes—BODY CELLS (somatic cells)
Human cells (eukaryotes) have 25,000 genes
Bacterium (prokaryotes) have 3,000 genes
Chromatin—chromosome material, diffused mass of DNA and protein molecules. Long thin fibers
Found in Interphase of Cell cycle
Chromatin to chromosomes
During interphase chromatin doubles its material—information for 46 chromosomes in humans, duplicates material for 92 chromosomes
As chromatin coils up (prophase)Sister chromatids (two identical copies) are
formed--figure 8.4bCentromere—connection between sister
chromatids
Daughter cells
Fuzzy appearance—intricate twists and folds of chromatin fibers
P130
Create table comparing/contrasting stages of mitosis
Leave out prometaphase, include interphase and cytokenesis
Chromosome/
chromatin state
Alignment of chromatids
Beginning/end
Interphase
prophase
metaphase
anaphase
telophase
cytokenesis
CELL CYCLE
P.129
• Chromatids (or pairs of chromosomes)
• separate and begin to move to opposite ends of
• the cell.
• Title: Mar 25 8:
• 52 PM (6 of 9)
• Two new nuclei form, one for each cell. ∙Chromosomes appear as chromatin. ∙Mitosis ends.
• Title: Mar 25 8:
• 53 PM (7 of 9)
• The cell membrane moves inward to create two
• daughter cellseach
• with its own nucleus with
• identical chromosomes.
• ∙ Interphase ∙The Chromosomes are copied• (# doubles).• ∙ Prophase ∙The nuclear membrane disappears.• ∙ Metaphase ∙Chromatids (or pairs of• chromosomes) attach to the spindle• fiber. ∙ Anaphase ∙Chromatids (or pairs of chromosomes)• separate and begin to move to opposite• ends of the cell.• ∙ Telaphase ∙Two new nuclei form, one for each cell.• ∙ Cytokinesis ∙The cell membrane moves inward to create• two daughter cellseach• with itso wn nucleus• with identical chromosomes.• Title: Apr 6 6:• 47 PM (9 of 9)