DNA is replicated before both mitosis and meiosis in interphase Cell also grows bigger and makes proteins necessary for new cells Cytokinesis Splitting of cell Occurs after nucleus division
(mitosis/meios is) Overview Mitosis Meiosis One cell division
Two cell divisions 2 daughter cells 4 daughter cells Each contains a single copy of all the
chromosomes Each contain a single copy of half the chromosomes (no homologous chromosomes) Mitotic Cycle
Checkpoints At certain points the cell cycle is halted until a go signal is sent Cyclin must bind to Cyclin Dependent Kinases Ensures proper timing of stages, prevents errors and cancers
Mitosis Meiosis Meiosis I homologous chromosomes separated 2 Major Events Segregation of Homologous
Chromosomes One homolog ends up in each gamete, leaving the cell with 23 unpaired chromosomes Independent Assortment Which homolog is inherited for
each pair is entirely random Meiosis II Sister Chromatids Separate Why does it look like some of the chromosomes have been switched? They have!
During meiosis, some of the homologous chromosomes are exchanged Increases genetic diversity The Importance of All This Mitosis creates
new identical cells so every cell in your body is the same Meiosis creates incredibly unique gametes, increasing genetic diversity
More diversity = more chances of someone surviving You Are A Unique Snowflake You randomly get 1 of every one of the 23 chromosomes from your father and from your mother So there were 223 possible combos of sperm and 223 possible eggs So about 8,388,608 possible sperms could have led to you
So there were about 70,368,470,000,000 possible combinations you could have been (not even counting crossing over!) You really are one in a trillion! Your Task In a method of your choosing animate out both mitosis and meiosis (1-3 people) Focus less on the stage names than on what is occurring over the process
So make a flipbook, gif, video etc. demonstrating the continuous process of the cell cycles Your initial cell should contain 3 pairs of homologous chromosomes (6 total) Label them 1A, 1B, 2A, 2B, 3A and 3B. Color code them
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