Cell Division Flashcards
(25 cards)
Four stages of cell division
- G1
- S-phase
- G2
- Mitosis
Cells that undergo rapid cell division
- epithelial cells
- hematopoetic stem cells
- spermatogonia
Cells that do not undergo cell division
- mature nerve tissues
- mature muscle tissues
- mature red blood cells
Cells that divide when induced
- liver cells
- lymphocytes
G1 checkpoint
cell size, growth factors, DNA damage, nutrients
G2 checkpoint
cell size, DNA damage, DNA replication
Mitosis checkpoint
chromosome attachment to spindle
DNA structure of prokaryotes
- circular
- helical
- double stranded
Cell division of prokaryotes
Binary Fission
Homologous chromosomes
possess gene that code for the same characteristic at the corresponding loci
Mitosis stage where chromosomes condense
Prophase
Mitosis stage where chromatids line up at the center
Metaphase
Mitosis stage where sister chromatids separate
Anaphase
Mitosis stage where cells are close to being separated completely
Telophase
True or False: In Meiosis I, it reduces chromosome number
True
True or False: In Meiosis II, it separates sister chromatids
True
In what stage of Meiosis does pairing of homologous chromosomes occur?
Prophase I
The point of crossing over of corresponding DNA segments
Chiasmata
Pairing and physical connection of replicated homologous chromosomes
Synapsis
Exchange of corresponding segments of DNA
Crossing over
Where does spermatogonia occur?
Testis
Where does oogonia occur?
Ovary
What stage of oogenesis does ovulation occur?
Secondary oocyte arrested in Metaphase II
When does a secondary oocyte become activated?
Fertilized by spermatozoa
