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Meiosis and Sexual Life Cycles Chapter 13 Genetics • • • • • • • • • • • • • • • Genetics is the Heredity is the Variation is Inheritance of Genes Genes are segments of Gametes are During ________________________, gametes unite to form a _________________, which develops into an _______________, then a _______________, and then a _______________. Types of Reproduction Asexual: a single Sexual: two Karyotypes A karyotype is a Homologous chromosomes are Types of Chromosomes 22 1 pair Women = Men = Diploid vs. Haploid Diploid Cells: • Haploid Cells: Meiosis • • • • • Meiosis is It ONLY happens Meiosis It’s like double mitosis – That way, after fertilization, the 4 daughter The process of meiosis • Meiosis happens Interphase Prophase I Crossing Over Metaphase I Anaphase I Telophase I and Cytokinesis Prophase II Metaphase II Anaphase II Telophase II and Cytokinesis Mitosis vs. Meiosis Mitosis Meiosis Why is crossing over important? • • • • • • • During Prophase I, This produces Powers natural selection/evolution: Makes species more Random Fertilization Each egg or sperm represents This is because during Metaphase I, So, • Each zygote