9.2 - Meiosis Flashcards
What 'meiosis' is The stages of meiosis The differences between meiosis and mitosis (25 cards)
What is meiosis?
Cell division forming four haploid cells
What happens before meiosis starts?
DNA is replicated
What are the two divisions of meiosis?
Meiosis I and Meiosis II
What happens during Meiosis I?
Homologous chromosomes are separated
What happens during Meiosis II?
Chromatids are separated
What type of division is meiosis?
Reduction division
What cells are formed during meiosis?
Haploid cells (gametes)
What are the stages of Meiosis I?
- Prophase I
- Metaphase I
- Anaphase I
- Telophase I
What are the stages of Meiosis II?
- Prophase II
- Metaphase II
- Anaphase II
- Telophase II
What happens during Prophase I?
3 key things
- Chromosomes condense
- centrioles migrate to opposite poles
- nucleolus disappears
What happens during Metaphase I?
2 key things
- Chromosomes line up in homologous pairs at the equator
- Each chromosome attaches to the spindle
What happens during Anaphase I?
1 key thing
Homologous chromosome pairs are separated and pulled to opposite poles
What happens during Telophase I?
3 key things
- Chromosomes uncoil
- nuclear envelope forms and nucleolus starts to reform
- cytokinesis
What happens during Prophase II?
3 key things
- Chromosomes condense
- Centrioles migrate to opposite poles
- nucleolus disapears and envelope breaks down
What happens during Metaphase II?
2 key things
- Chromosomes line up at the equator
- Each chromosome attaches to spindle at centromere
What happens during Anaphase II?
2 key things
- Centromeres divide and seperate each chromosome pair
- chromatids pulled to opposite poles of cell by spindle fibers
What happens during Telophase II?
Chromatids uncoil
What type of cells does meiosis produce?
Haploid
How many cells are produced in meiosis?
4
What is the function of meiosis?
Production of gametes
What type of reproduction is meiosis involved in?
Sexual
What type of cells does meiosis produce (diploid or haploid)?
Haploid
How many cell divisions occur in meiosis?
2
Does meiosis create genetic variation?
Yes
