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Meiosis

Meiosis. Mitosis Review animation. Asexual (vegetative) Reproduction-. one parent produces an offspring Uses only mitosis Produces genetically identical offspring (each offspring is an exact copy of the original organism) Rapid - no need to find mates

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Meiosis

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  1. Meiosis

  2. Mitosis Review animation

  3. Asexual (vegetative) Reproduction- • one parent produces an offspring • Uses onlymitosis • Produces genetically identical offspring (each offspring is an exact copy of the original organism) • Rapid- no need to find mates • No mechanism for genetic diversity- works well in a stable, unchanging environment.

  4. Sexual Reproduction- • the formation of a new individual by a combination of two haploid sex cells • Uses Meiosis- a specialized type of cell division which halves the # of chromosomes in a gamete • Female Gamete • egg (ovum) • Male Gamete • sperm • Requires Fertilization- • the union of a sperm and an egg • (N + N = 2N) • Makes a zygote- • the product of fertilization (has two sets of chromosomes) • Causes changes in the genetic information • in order to increase the diversity in the offspring.

  5. How are the Goals of MEIOSIS Different from the Goals of MITOSIS?

  6. How Meiosis Works: Animation A few more Vocabulary Words: • Germ Cells- • Cells that give rise to the gametes of organisms • They are in the process of or have the potential to undergo meiosis. • Somatic Cells- • cells that do not have the potential to form gametes • Synapsis- • The pairing of homologous chromosomes during prophase of meiosis I

  7. Tetrad- • a unit of 4 chromatids formed by a synapsed pair of homologous chromosomes, each of which has two chromatids • Crossing Over- • The process by which homologues exchange segments with each other. • Genetic Recombination- • the reshuffling of genes on a chromosome. Caused by breakage of DNA and its reunion with the DNA of a homologous chromosome.

  8. Meiosis • animation

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