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Download Mitosis Notes 1/17/17 Cell Division Review Cells divide sexually
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Transcript
Mitosis Notes 1/17/17 Cell Division Review Cells divide sexually and asexually Prokaryotes divide via _________________________________________ (type of asexual reproduction) Eukaryotes divide sexually and asexually Sexual Reproduction occurs when an egg and sperm fuse (process is called __________________________) to form a _____________________ (fertilized egg) Sperm (XY) and Egg (XX) cells aka sex cells or ______________________ are ____________________ cells Body cells (aka _____________________________ Cells) are ________________________ cells that reproduce asexually in order for growth, repair, and replacement. Cell’s Life: Divide or Die Cell Growth Cycle • Interphase (___________________) • Mitosis (____________________) • Cytokinesis (__________________________________) Interphase (G1, S, G2) occurs before mitosis begins • Time between cell division (_______% of a cells life is spent during this phase) • Chromosomes are copied (# doubles) • Chromosomes appear as threadlike coils (_____________________) at the start, but each chromosome and its copy (sister chromosome) change to sister chromatids at end of this phase MITOSIS Division of the nucleus into two identical cells that are the same number and same kinds of chromosomes as the original cell Mitosis occurs in all __________________________ cells (aka body cells) ex. Skin, liver, heart, stomach Consists of 4 phases: Prophase, Metaphase, Anaphase, Telophase Prophase 1st step in Mitosis • Mitosis begins (cell begins to ___________________) • ____________________________ (or poles) appear and begin to move to opposite end of the cell. • ________________________________ form between the poles. Metaphase 2nd step in Mitosis • ____________________________ (or pairs of chromosomes) attach to the spindle fibers. • Chromosomes line up at the _______________________ of the cell (Mmmmeta- Mmmmmmiddle) Anaphase 3rd step in Mitosis • Chromatids (or pairs of chromosomes) separate and begin to move to __________________________________ of the cell. Telophase 4th step in Mitosis • Two new __________________ form. • Chromosomes appear as chromatin (__________________ rather than rods). • Mitosis ends. Cytokinesis • Division of ___________________________ that occurs after mitosis • Cell membrane moves inward to create two daughter cells – each with its own nucleus with _______________________________ chromosomes. • Animal Cells- ________________________ moves inward and pinches into two identical ________________ • Plant Cells- a _________________________ forms in the middle of the cell and eventually a __________________________ separates the two cells