Revision Worksheet Notes Flashcards
What is binary fission
Involves division of the parent body in two, fairly equal, parts to produce two identical cells. It is a form of asexual reproduction.
Explain why the formation of the cross wall is important in binary fission.
It separates the parent and daughter cell into two identical cells.
Explain the term generation time
The time it takes for a population of bacteria to double in number,
Outline what occurs in interphase?
The cell grows,
carries out its normal activities,
replicates its DNA,
prepares for cell division.
Outline what occurs in mitosis
The nucleus of the cell divides in two
Outline what occurs in cytokinesis
Cytoplasm divides and two new daughter cells are produced.
What is the purpose of mitosis?
To ensure that the two daughter cells inherit an equal and identical complement of chromosomes.
What must occur before mitosis takes place?
Interphase
What is the purpose of the spindle fibers?
To equally divide the chromosomes
Where do spindle fibers originate?
Centrosomes
Summarize what happens in prophase.
- Chromosome condenses
- Nucleolus disappears
- Nuclear envelope breaks down
- Chromosomes are released
Summarize what happens in metaphase.
- Chromosomes continue to be condensed
- Nucleus disappears
- Chromosomes align in the center of the dividing cell
Summarize what happens in anaphase?
- Sister chromatids separate from each other
- Chromatids are pulled to opposite ends of the cell
What happens during telophase?
- Chromosomes begin to uncoil
- Nuclear membrane forms around each set of chromosomes
What is the purpose of cytokinesis?
To physically separate a mother cell into two daughter cell
