Cell Cycle Cell Reproduction When a cell divides
- Slides: 17
Cell Cycle
Cell Reproduction • When a cell divides in two cells • Cells need to grow larger because there is a limit to cell size • Needed to replace dead cells • Composed to MITOSIS and CYTOKINESIS
Chromosome Replication • Chromosomes are uncoiled and duplicated • CHROMATIDS are the two identical strands of a duplicated chromosome joined at the centromere
Cell Cycle Interphase • Rest/growth phase • Cell grows bigger • Chromosomes are uncoiled and duplicated
Cell Cycle Prophase • Preparing for mitosis • Chromosomes begin to coil And condense into visible threads • Centrioles move to the opposite ends of the cell • The spindle fibers form between the centriole pairs • Nuclear membrane breaks down and disappears
Cell Cycle Metaphase • Middle stage of mitosis • Paired chromatids begin to move towards the center of the cell between the two centrioles
Cell Cycle Anaphase • Leaving stage of mitosis • Each pair of chromatids splits at the centromere and becomes a single chromosome so there are TWICE as many chromosomes • Chromatids move to opposite ends of the cell
Cell Cycle Telophase • The last stage • Nuclear membranes form around the two new sets of chromosomes • Spindle disappears • Chromosomes begin to uncoil and gradually become less visible • Now two nuclei in the cell
Cell Cycle Cytokinesis • “Dividing materials • Division of organelles and the other substances in the cytoplasm into roughly equal halves • In animal cells, an indent forms in the cell membrane and deepens until the cell is pinched into half • In plant cells, a cell plate enlarges until it reaches the outer surface splitting the cell in half
Meiosis • For the production of gametes 1. Interphase 1. chromosomes duplicate
Meiosis 2. Prophase I - Chromosomes coil and become visible - Nuclear membrane disappears (crossing over may occur) - Spindle forms 3. Metaphase I - Chromosomes move to the middle and line up beside each other (crossing over may occur)
Meiosis 4. Anaphase I - Chromosomes move apart 5. Telophase I - Paired chomosomes uncoil - Nuclear membrane forms - Spindle disappears 6. Cytokinesis - TWO CELLS
Meiosis 7. Prophase II – Paired chromatids coil – Spindle forms – Nuclear membrane disappears 8. Metaphase II – Chromosomes line up in the middle of the cell 9. Anaphase II - each chromosome splits - move to the opposite ends of the cell
MEIOSIS 10. Telophase II - chromosomes uncoil - nuclear membrane form 11. Cytokinesis - Total of 4 cells from one cell
QUIZ 2
- Sexual reproduction vs asexual reproduction venn diagram
- Asexualk
- Venn diagram of asexual and sexual
- Pteris sp
- What is the purpose of mitosis?
- B divides a
- Body planes directions and cavities
- Teamwork divides the task and multiplies the success author
- Prime meridian
- Trunk in human body
- A dimension is a measurement written as a _____.
- A strip of land that divides the desert from wetter areas
- Anterior posterior plane
- Ventral cavity
- Hip protraction
- Dorsal and ventral meaning
- What divides the nasal cavity
- Teamwork divides the task and multiplies the success