1 / 17

MEIOSIS

MEIOSIS. Meiosis Basics. Meiosis is the process of cell division in which the number of chromosomes is reduced by half to form sex cells or gametes (sperm & egg) One parent cell produces four daughter cells .

horace
Download Presentation

MEIOSIS

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. MEIOSIS

  2. Meiosis Basics Meiosis is the process of cell division in which the number of chromosomes is reduced by half to form sex cells or gametes (sperm & egg) One parent cell produces four daughter cells . Daughter cells have half the number of chromosomes found in the original parent cell

  3. Meiosis Basics (Continued) During meiosis, DNA replicates once, but the nucleus divides twice. Four stages can be described for each division of the nucleus.

  4. Meiosis I: First division of Meiosis • Prophase 1: Each chromosome duplicates and remains closely associated. These are called sister chromatids. Homologous chromosomes line up side by side and exchange genetic material (Crossing Over) • Metaphase 1: Chromosomes align at the center of the cell. • Anaphase 1: Chromosome pairs separate with sister chromatids remaining together. • Telophase 1: Two daughter cells are formed with each daughter containing only one chromosome of the chromosome pair.

  5. Crossing of Homologous Chromosomes:During Prophase I

  6. Prophase I http://everyschool.org/u/logan/cellreproductionx/rogersa/research/meiosis.html

  7. Prophase I http://everyschool.org/u/logan/cellreproductionx/rogersa/research/meiosis.html

  8. Metaphase I http://everyschool.org/u/logan/cellreproductionx/rogersa/research/meiosis.html

  9. Telophase I http://everyschool.org/u/logan/cellreproductionx/rogersa/research/meiosis.html

  10. Meiosis II: Second Division of Meiosis • Prophase 2: DNA does not replicate. • Metaphase 2: Chromosomes line up at the center of the cell • Anaphase 2: Centromeres divide and sister chromatids move separately to each pole. • Telophase 2: Cell division is complete. Four haploid(half the number of chromosomes -23) daughter cells are formed.

  11. Prophase II http://everyschool.org/u/logan/cellreproductionx/rogersa/research/meiosis.html

  12. Metaphase II & Anaphase II http://everyschool.org/u/logan/cellreproductionx/rogersa/research/meiosis.html

  13. Telophase II http://everyschool.org/u/logan/cellreproductionx/rogersa/research/meiosis.html

  14. Meiosis http://www.biosci.uga.edu/almanac/bio_103/notes/apr_3.html.

  15. Meiosis Animation http://www.rothamsted.bbsrc.ac.uk/notebook/courses/guide/movie/meiosis.htm

  16. Differences in Mitosis & Meiosis • Mitosis • Asexual • Cell divides once • Two daughter cells • Genetic information is identical • Meiosis • Sexual • Cell divides twice • Four haploid daughter cells • Genetic information is different

  17. Comparison Animations http://www.pbs.org/wgbh/nova/baby/divi_flash.html http://www.usoe.k12.ut.us/curr/science/sciber00/7th/genetics/sciber/animatin.htm

More Related