Bio1_14_Meiosis - 1 Self-Quiz 1 Give the 3 stages of...

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Unformatted text preview: 1 Self-Quiz 1. Give the 3 stages of interphase with the key events for each stage. 2. Give the phases of mitosis with the key events for each phase. 3. What is cytokinesis? How does it differ in plants and animals? 4. What are the major characteristics that distinguish cancer cells from normal? 5. Mutations of what genes cause cancer? 6. Describe binary fission. Overview: Meiosis • Ch. 10: Meiosis & Sexual Reproduction – Chromosomes – Genetic variation – Meiosis •Meiosis I •Meiosis II – Mitosis vs. meiosis – Human life cycle – Chromosome changes Asexual vs. Sexual Reproduction • Asexual reproduction – Offspring genetically identical to parent – Mitosis • Sexual reproduction – Meiosis – Gamete formation – Fertilization – Increases variation •Natural selection Homologues & Chromosome # • Meiosis – Diploid (2 n ) germ cells b haploid ( n ) gametes – Homologous chromosomes separated •Same genes, but may have different alleles • Fusion of gametes b diploid (2 n ) zygote Assignment 1 • Think, Pair, Share • Topic: Most of our cells have two sets of chromosomes (2 n = 46). – Why is it important for germ cells to reduce that number by half to only one set of chromosomes ( n = 23) in gametes? Meiosis Resembles Mitosis • Interphase: DNA replication • Chromosomes – Sister chromatids – Homologues have same length & centromere location Meiosis: Two Divisions • Meiosis I – Synapsis of homologues (bivalent/tetrad) – Homologues separate – Single diploid cell...
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Bio1_14_Meiosis - 1 Self-Quiz 1 Give the 3 stages of...

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