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
Cellular Reproduction Cell Reproduction What is cell reproduction
GROWTH REPRODUCTION Diatom lifecycle Asexual phase Cell divides
THE CELL CYCLE Mitosis SEXUAL REPRODUCTION Sexual reproduction
CELLULAR REPRODUCTION Asexual Vs Sexual Reproduction ASEXUAL REPRODUCTION
REPRODUCTION Asexual Reproduction Sexual Reproduction in Animal Sexual
La reproduction asexue Reproduction asexue La reproduction asexue
Reproduction in plants 1 Sexual reproduction A Reproduction
Sexual reproduction L Mathias Sexual reproduction Sexual reproduction
VIII CELL REPRODUCTION VIII CELL REPRODUCTION Overview Why
The Cell Cycle Cell Division The Cell Cycle
The Cell Cycle Cell Division The Cell Cycle
The Cell Cycle Cell Division The Cell Cycle
CELL CYCLE CELL DIVISION CELL CYCLE The sequence
GENETICS Mitosis and the Cell Cycle Cell reproduction
Prokaryotic cell reproduction Binary Fission Eukaryotic Cell Cycle
Cell Reproduction The Cell Cycle 1 Interphase 90
CELL REPRODUCTION THE CELL CYCLE AND MITOSIS Lesson