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Meiosis

Meiosis. Bio 2 Murphy. What is meiosis?. the production of haploid cells with unpaired chromosomes - word means "to diminish". It does two things: 1. it takes a diploid cell and makes copies of cells that are haploid

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Meiosis

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  1. Meiosis Bio 2 Murphy

  2. What is meiosis? • the production of haploid cells with unpaired chromosomes - word means "to diminish". • It does two things: 1. it takes a diploid cell and makes copies of cells that are haploid 2. it scrambles the specific forms of each gene that each of the gametes (sperm & egg) receive.

  3. Key points of Meiosis • The process results in 4 daughter cells • Daughter cells are haploid • Daughter cells have unique combinations of chromosomes • Daughter cells do not have homologous pairs • Creates gametes (eggs & sperm) • Ensures variability in offspring • Gametes combine to create a zygote (2N) – process of sexual reproduction

  4. Sexual Reproduction Gametes: egg & sperm – each is haploid Egg is fertilized creating a zygote If the each gamete were n (23 chromosomes) what is 2n?

  5. Overview of Meiosis -- occurs in two stages Meiosis I and Meiosis II

  6. Why scramble the genes? A: It is good for genetic diversity. How is it accomplished? Through independent assortment and crossing-over. What does this mean?

  7. Why scramble the genes? The scrambling of genes is good for genetic variation. Crossing over: occurs when a section of chromosomes changes place with a section of its homologous chromosome.

  8. Why scramble the genes? • Independent assortment: depending on how the chromosomes arrange themselves during metaphase I, the cells formed can have a variety of different chromosome combinations.

  9. The Phases of Meiosis

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