Interphase contains g1 s g2 g1 longest phase contains

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Interphase: contains G1, S, G2 G1: longest phase; contains G1 checkpoint S: DNA synthesis/ chromosome replication G2: synthesize proteins for M phase M: composed of mitosis and cytokinesis Checkpoints: G1, G2, Metaphase Checkpoint o Act as sensors to determine if cell is ready for next phase loss of checkpoint results in mutations/ cancer o Cyclins: G1 and G2 checkpoint proteins o Amounts vary as cell cycle progresses o Bind to and turn on cyclin dependent kinases (CDKs) needed to continue in cycle Mitosis Part of the M phase; consists of 5 phases that occur after interphase; generally forms 2 daughter cells Phases: 1. Prophase: chromosomes condense 2. Prometaphase: nuclear membrane breaks down; spindles form; kinetochore microtubules attach to kinetochore proteins 3. Metaphase: sister chromatids align on metaphase plate 4. Anaphase: sister chromatids separate and move to opposite poles 5. Telaphase/cytokinesis: nuclear membrane reforms; cleavage furrow separates 2 daughter cells Meiosis Haploid (N) daughter cells produced from a diploid (2N) parent 2 rounds of division meiosis I and meiosis II Maintains chromosome numeber from generation to generation Meiosis I 1. Prophase I: tetrads form; CROSSING OVER occurs 2. Prometaphase I: bivalents attach to microtubules 3. Metaphase I: bivalents randomly align on plate 4. Anaphase I: homologous chromosomes move to separate poles 5. Telaphase I: haploid daughter cells separate Meosis II 1. Prophase II : NO tetrads or crossing over 2. Prometaphase II : sister chromatids attach to microtubules 3. Metaphase II : sister chromatids align on metaphase plate 4. Anaphase II : sister chromatids separate and move to opposite poles 5. Telaphase II: cleavage; 4 haploid cells produced
BISC 207 Exam 3 Blended Inheritance Once a popular idea about genetics Offspring were averages of their parents ex: tall x short medium Mendel

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