1 / 18

Mitosis & Meiosis Thurs 10/10/13

Mitosis & Meiosis Thurs 10/10/13. finish digestion end of lecture outline on “Role of Macromolecules” posted online; cover on your own Chromosomes & DNA homologous chromosomes / sister chromatids Cell cycle Mitosis - cellular division growth & repair

bryga
Télécharger la présentation

Mitosis & Meiosis Thurs 10/10/13

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. Mitosis & Meiosis Thurs 10/10/13 • finish digestion • end of lecture outline on “Role of Macromolecules” posted online; cover on your own • Chromosomes & DNA • homologous chromosomes / sister chromatids • Cell cycle • Mitosis - cellular division • growth & repair • Meiosis - sexually reproducing species • production of gametes (eggs & sperm)

  2. Mitosis: process of cellular division • Meiosis: • special type of cell division

  3. Terminology: • Chromosomes • 46 in each body cell - EXCEPT gametes • diploid - • haploid - • 22 pairs of homologous chromosomes (autosomes) • 1 pair of • duplication of DNA -- • sister chromatids

  4. Humans have 22 pairs of autosomes and 1 pair of sex chromosomes. • karyotype: • chromosomes are in

  5. Chromosomes: page 84 • ~40% DNA & 60% proteins • contains genes • 23 pairs of chromosomes (46) • each member • duplication of chromosomes prior to cell division

  6. GENES

  7. DNA replication necessary prior to cell division • Replication of DNA • unzip strands • precise copying

  8. Cell Cycle: mitosis • normal • cell divides • some will • some go off and carry out • cancer – fig 5.4

  9. Mitosis - cell division Fig 5.5 fig 9.2

  10. Meiosis: formation of gametes • adults - • gametes (egg & sperm) • fertilization • fertilized ovum fig5.14 • growth & development

  11. Meiosis: • DIPLOID organisms - • homologous pairs • providing each daughter cell • when gametes fuse fig 5.8 • will go through stages in lab • learn the sequence & importance of the events • will not test on specific names of stages

  12. The Process of Meiosis: Meiosis I diploid ---> haploid: h fig.15.9

  13. The Process of Meiosis: Meiosis II haploid ---> • cells have • chromosomes • sister chromatids • sister chromatids • total • daughter cells fig.15.12

  14. Sources of Genetic Variation: • Crossing over during Meiosis I • exchange of alleles • swapping of the fig5.10 • alleles

  15. Sources of Genetic Variation: • independent assortment of chromosomes during meiosis I figure15.11

  16. Sources of Genetic Variation: • Independent assortment • Random Fertilization! • 8+ million possible • 8+ million possible

  17. Key Events in Meiosis:

  18. Mitosis vs. Meiosis • Mitosis • Meiosis Be comfortable with figure5.13

More Related