Ch 13 Meiosis Sexual Reproduction

Asexual Reproduction Single Parent Mitotic Division Clone Hydra Budding

Life Cycle Somatic Cells: Haploid, diploid, chromosomes Karyotype, homologous chromosomes Sex Chromosomes vs. Autosomes Fertilization, syngamy, zygote

Human Life Cycle

Marvelous Meiosis! ~2x IPPMAT Meiosis I: interphase I prophase I Prometaphase I metaphase I anaphase I telophase I

Marvelous Meiosis! Meiosis II (no interphase) prophase II metaphase II anaphase II telophase II

Comparison of Mitosis and Meiosis

Internet Help Meiosis Animation/quiz Meiosis Animation

Independent Assortment Number of Possible Combinations Of Chromosomes is 2n where n=haploid number If 46 chromosomes then 223 Or about 8 million combinations

Crossing Over Recombination of chromosomes Occurs in Meiosis I (prophase I) Chiasmata/synaptonemal complex

Reasons for such Variability Independent Assortment Crossing Over Random fertilization Independent Assortment give 8 million possibilities W/ Crossing over and Random Fertilization Humans have possibility of over 64 trillion combinations between two parents.