Cell Division; biology

Card Set Information

Author:
efrain12
ID:
136083
Filename:
Cell Division; biology
Updated:
2012-02-18 00:22:28
Tags:
bio
Folders:

Description:
lecture notes
Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user efrain12 on FreezingBlue Flashcards. What would you like to do?


  1. Interphase
    growing and getting ready to divide
  2. Mitosis
    cells dividing
  3. dividing cell does...(3)
    -precisely replicates its DNA

    -allocates the 2 copies f DNA to opposite ends of cell

    -seperates into 2 daughter cells that are same
  4. (interphase) G1
    -normal cell operation and growth

    -12 hrs
  5. (interphase) S
    DNA is replicated
  6. (interphase) G2
    • cell growth and preparation for cell division
    • -5.5 hours
  7. what happens during S phase...(3)
    -DNA double helix unwinds

    - protein wraps around DNA to make chromatin

    -chromatin condenses forming 2 chromatids.
  8. G2 features (3)
    -well defined nucleous bounded by nuclear envelope

    -one or more nucleoli

    -chromosomes that are loosely packed with chromatin fibers
  9. Cytokinesis
    -splitting of cytoplasm
  10. Prophase (4)
    -DNA begins to condense or thicken becoming more visible

    -nuclear membrane and nucleoli start to disappear

    -sister chromatids join togehter by centromeres

    -centrioles migrate to opposite ends of cell
  11. PArts of Chromosomes (4)
    -Telomeres

    -centromere

    -heterochromatin

    -Euchromatin
  12. Telomeres (3)
    chromosome tips

    -Consists of repeating sequence TTAGGG

    -protects chromosomes from breaking
  13. Centromere (3)
    -part where spindle fibers attach when cell divides

    -replicated toward the end of S stage

    -mostly structural role, maintain chromosome together
  14. Heterochromatin (2)
    dark areas of a chromosome

    -highly repetitive DNA sequences
  15. Euchromatin (3)
    light areas of chromosome

    -more protein-encoding sequences

    -genes
  16. Sub-telomeres
    bridge gap between gene-rich regions and telomeres
  17. Kinetochore
    specialized region formed right before mitosis where spindle fibers can attach.
  18. Metaphase (3)
    spindle fibers extend from the poles toward the cells equator

    -microtubules become attached to the centromere on the chromosomes

    -early in this stage chromosomes develop kinetochores
  19. Karyotypes (3)
    method of displaying matching of homologous chromosomes

    -only visible if chromosomes are condense during replication

    -humans 22 pairs of autosomes, 1 pair of sex
  20. Anaphase (3)
    -spindle fibers begin to shorten seperating sister chromatids

    -seperated chromatids now called chromosomes

    -motor proteins move chromatids along microtubules
  21. Telophase
    -nuclear envelope appears to form

    -spindle fibers disappear

    -chromosomes decondense

    -2 daughter cells.
  22. Cytokinesis
    in animals, it occurs by a process called cleavage

    in plants, it occurs by the formation of cell plate

What would you like to do?

Home > Flashcards > Print Preview