cell cycle & mitosis!!!
DESCRIPTION
This is a clear to understand presentation about the cell cycle and the process of mitosis. After reading this, you will get a deeper sense of the importance of cell cycle and mitosis that is going on inside every living thing.TRANSCRIPT
CELL CYCLE & MITOSIS
Cell Cycle
90% of the cell cycle is in interphase, other 10% is mitosis (cellular division)
Interphase composed of 3 phases: G1, S, and G2 G1 (Gap 1) phase: cellular growth and protein synthesis, in
preparation for the S phase S (Synthesis) phase: DNA synthesis/replication of each
chromosome in the cell, forms sister chromatids. G2 (Gap 2) phase: cellular growth as well as protein & lipid
synthesis, in preparation for mitosis Ex. Synthesis of proteins used to form mitotic spindle
Mitosis
Cellular division of a cell Makes exact copy of mother cell Produces 2 identical daughter cells Each product has same # of chromosomes Purpose of mitosis?
To form a multicellular organism from a zygote To replace dead or lost cells, such as skin and red
blood cells
Phases of Mitosis: (PMAT) + cytokinesis
Prophase: chromosomes become visible, begin to condense
Prometaphase: nuclear envelope disappears and chromosomes attach to mitotic spindle
Metaphase: chromosomes line up at metaphase plate/equatorial plane
Anaphase: sister chromatids separate by kinetochores Telophase: two daughter nuclei reform at the 2 poles
Cytokinesis (division of the cytoplasm) occurs simultaneously
Interphase Prophase
Metaphase Anaphase
Mitosis in plant cells differ from mitosis in animal cells Plant cells do not form centrioles during mitosis Plant cell walls are too rigid to form cleavage furrow
Forms cell plate instead
cell plate
Telophase/cytokinesis in a plant cell
cleavage furrow
Telophase/cytokinesis in an animal cell
Some terms
Gene: portion of DNA that encodes RNA and protein; determines your characteristics—freckles, height, eye color…
Chromosomes: contain DNA and protein; compact way of carrying all genetic info
Sister chromatids: copies of chromosomes joined together
Activities
A. Bead modeling B. View plant/animal cell slides
Part 1:View & draw Alium onion root tip, estimate % of time in each phase, answer questions
Part 2: View & draw White fish blastulae, estimate % of time in each phase, answer questions Exercise B: write answers on whiteboard (details on next
slide)