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13.1 Ecologists Study Relationships 6.2 Meiosis 6.2 Process of Meiosis What is the purpose of mitosis? 6.2 Process of Meiosis What is the purpose of mitosis? Growth!!! 6.2 Process of Meiosis Meiosis: • Cell division that creates gametes (sex cells, sperm and eggs) 6.2 Process of Meiosis Meiosis: • Creates haploid cells (23 chromosomes) 6.2 Process of Meiosis Meiosis: • creates genetically unique cells (diversity) 6.2 Process of Meiosis Meiosis: • happens in sex organs (testes/ovaries) ONLY!! 6.2 Process of Meiosis Meiosis: • Occurs only during sexual maturity 6.2 Process of Meiosis Meiosis: • Requires two rounds of cell division (2 PMATs!) 6.2 Process of Meiosis Sperm vs. Egg Sperm • Tiny • Just DNA and a tail (flagellum) • Produced in testes (males) Eggs • Big • Contains DNA, organelles, and cytoplasm • Produced in ovaries (females) 6.2 Process of Meiosis How is this different from mitosis? 6.2 Process of Meiosis How is this different from meiosis? How organisms grow 6.2 Process of Meiosis Watch Meiosis Video • https://www.youtube.com/watch?v=rqPMp0U0HOA 6.2 Process of Meiosis 6.2 Study Guide Due @ end of class 6.2 Process of Meiosis heredity • The passing on of characteristics (traits) from parents to offspring 6.2 Process of Meiosis • Genetics is the study of heredity 6.2 Process of Meiosis Genes – section of DNA that codes for a trait 6.2 Process of Meiosis Trait: a feature an organism has 6.2 Process of Meiosis • Each organism has two alleles for each trait Alleles - different forms of the same gene 6.2 Process of Meiosis Rule of Dominance • The trait that is observed in the offspring is the dominant trait (uppercase) • The trait that disappears in the offspring is the recessive trait (lowercase) 6.2 Process of Meiosis Law of Segregation • The two alleles for a trait must separate when gametes are formed • A parent randomly passes only one allele for each trait to each offspring 6.2 Process of Meiosis Law of Independent Assortment • The genes for different traits are inherited independently of each other.
