BI 253 Meiosis:Mitosis
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What are the 5 steps of mitosis?
What phase of the cell cycle occurs b/f mitosis?
What 3 events occur during prophase at the beginning of mitosis?
- Chromosomes condense & become visible
- Kinetochores develop
- Mitotic spindle begins to develop
The 2nd phase of mitosis where the nuclear envelope disappears & the spindle fully develops is called ____.
What 2 events occur in the metaphase of mitosis?
- Centromeres are at the equatorial plate
- Chromotids connect to 1 pole or the other
What occurs during the anaphase of mitosis?
Chromatids separate toward opposite ends of the spindle
In mitosis chromosomes finish moving & nuclear envelopes form during the ____.
What occurs after telophase in Mitosis?
What are the 2 sections of meiosis?
Meiosis I & II
What are the 5 phases of Meiosis I?
- Prophase I
- Prometaphase I
- Metaphase I
- Anaphase I
- Telophase I
What 3 things occur during prophase I of meiosis?
- Chromosomes condense
- Genetic material crosses over
- Synapses align homologs
Mitotic spindle starts to attach to kinetochores & nuclear envelope breaks down. Events of ____ phase of meiosis I.
During Metaphase I, Homologous prs line up in the ___ ___.
Metaphasal or Equitorial Plate
During anaphase I homologous chromosomes do what?
Separate & move toward opposite poles of the cell
What occurs during telophase I?
Chromosomes gather in nucleus & cell divides
What is the main purpose of Meiosis I?
Separate homologous chromosomes
When is DNA replication completed with regards to Meiosis I & II?
Prior to meiosis beginning
During prophase II what happens?
Chromosomes condense again
In meiosis II chromosomes line up along metaphase plates during what stage?
In anaphase II ___ ___ ___.
Sister Chromatids separate
In what phase of Meiosis II does the nuclear membrane reform?
What are the products of meiosis II?
4 new cells that are haploids
What are the main objectives of meiosis I?
Diploids → Haploids
What is the problem w/ the end product of meiosis I?
2 sister chromatids are formed which are duplicated chromosomal material
What is the objective of meiosis II?
Separate sister chromatids fr meiosis I
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