Cell Division Flashcards
State what the cell cycle is.
A process involving the GROWTH of the cell and REPLICATION of the genetic material to make 2identical daughter cells
Name the stages of the cell cycle.
Interphase
Prophase
Metaphase «< Mitosis
Anaphase
Telophase
Cytokinesis (cytoplasmic division)
Explain why the cell cycle doesn’t occur in some cells.
Some cells (e.g. neurons) don’t have the ability to DIVIDE after DIFFERENTIATION.
What is the difference between the cell cycle and mitosis?
Cell cycle is the growth period between divisions.
Mitosis is only 10% of the cycle and is just nuclear division.
State the purpose of mitosis.
Produces 2 genetically identical daughter cells for:
Growth
Cell replacement / tissue repair
Asexual reproduction
Name the stages of mitosis.
P = Prophase
M = Metaphase
A = Anaphase
T = Telophase
What types of organism undergoes either cell cycle or binary fission or viral replication?
Eukaryotes undergo cell cycle.
Prokaryotes undergo binary fission.
Viruses undergo viral replication.
How many pairs of chromosomes do human cells contain?
23
How many chromosomes does a human cell have?
46
What are diploid cells?
Cells that contain chromosome PAIRS - 46 total.
What are haploid cells?
A cell that contains a single set of chromosomes - 23 total.
What is cytokinesis?
When a diploid cell divides to form 2 IDENTICAL daughter cells.
What occurs in the mitotic phase during the cell cycle?
Nucleus divides into 2 daughter nuclei. (mitosis)
Cell divides into 2 daughter cells with a nucleus. (cytokinesis)
What’s the difference between mitosis and cytokinesis?
Mitosis divides the nucleus.
Cytokinesis divides the cell cytoplasm.
What does the mitotic phase consist of?
Mitosis
Cytokinesis
What is chromatin?
Combination of DNA and proteins that make up chromosomes.
What are replicated chromosomes called?
Sister chromatids
What is the point where sister chromatids are joined called?
Centromere
During interphase. the chromosomes are…
not visible as distinct structures in the nucleus - not condensed.
Describe the interphase stage of the cell cycle.
1~ DNA is DECONDENSED so chromosomes are not visible
2~ DNA replication and replication of ORGANELLES occurs
3 ~ Protein synthesis.
Describe the prophase stage in mitosis.
1~ Chromosomes CONDENSES & become VISIBLE in the nucleus.
2~ Nucleolus disappears, nuclear envelope breaks down.
3~ CENTRIOLES move to opposite poles of cell, and produces SPINDLE fibres.
4~ Spindle attaches to CENTROMERE of each chromosome.
Describe the metaphase stage in mitosis.
1~ Spindle fibres line up the chromosomes along the EQUATOR / centre of the cell.
Describe the anaphase stage in mitosis.
1~ Spindle fibres shorten.
2~ This SEPARATES the sister chromatids as they are pulled to opposite poles of the cell.
Describe the telophase stage in mitosis.
1~ Spindle breaks down.
2~ Chromosomes DECONDENSE & become invisible again.
3~ 2 new NUCLEAR ENVELOPES form and the nucleolus reappears in each nucleus.