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BIOL 155 Study Guide - Summer 2019, Comprehensive Final Exam Notes - Mitosis, Meiosis, Dna


Department
Biology
Course Code
BIOL 155
Professor
Mark Miller
Study Guide
Final

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BIOL 155

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Lecture 1
Biology
Cell Division: Mitosis and Meiosis
Meiosis
Why have 2 kinds of cell division?
o Mitosis creates 2 identical copies of the
original cell
o Life forms could only be very simple
o Meiosis generates 4 completely NEW, genetically
unique cells (from one cell)
o Variation is really important
o No 2 organisms are identical
o More likely for a species to survive disease
o Shapes evolutionary course of species
Cells divide at a specific time in their life cycle
Same cell cycle as mitosis
Meiosis goes through mitotic phase twice
Meiotic cell division
Gametes (sperm and egg cells)
o Have half of genetic information
Meiosis I
o Interphase
o Prophase I (early)
Chromosomes condense and become visible
(2n=4)
o Prophase I (late)
Crossing over occurs
Spindle forms
Nuclear envelope breaks up
o Metaphase I
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Paired homologous chromosomes align along
equator of cell
Find each other, stay associated and there
are pairs of homologous chromosomes
o Anaphase I
Homologous chromosomes separate to opposite
poles of cell
Sister chromatids remain joined
o Telophase I & cytokinesis
Meiosis II
o Prophase II
Spindles form
Nuclear envelopes break up
o Metaphase II
o Anaphase II
o Telophase II & cytokinesis
o Four non-identical haploid daughter cells (n=2)
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