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Questions and Answers
What happens during Early Prophase 1?
What happens during Early Prophase 1?
- Independent assortment of bivalents occurs
- Homolog pairs of non-sister chromatids come together in synapsis (correct)
- Crossing over between non-sister chromatids takes place
- The cell divides into two
What is the main event that occurs during Late Prophase 1?
What is the main event that occurs during Late Prophase 1?
- Separation of homologous chromosomes
- Crossing over between homologous non-sister chromatids (correct)
- Formation of haploid cells
- Independent assortment of bivalents
What occurs during Metaphase 1?
What occurs during Metaphase 1?
Independent assortment of all the bivalents.
What happens during Anaphase 1?
What happens during Anaphase 1?
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What is the outcome of Telophase 1?
What is the outcome of Telophase 1?
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What is the end result of Meiosis 1?
What is the end result of Meiosis 1?
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Study Notes
Early Prophase 1
- Homologous non-sister chromatids form pairs during synapsis.
- Resulting structure is called a bivalent, consisting of homologous sister chromatids.
Late Prophase 1
- Crossing over occurs between homologous non-sister chromatids.
- Chiasmata are formed within the synaptonemal complex, leading to exchange of chromosome sections.
Metaphase 1
- Independent assortment of bivalents takes place.
- Bivalents can orient in multiple ways, allowing for diverse combinations of alleles.
- This process contributes to genetic variation in haploid cells at the end of Meiosis 1 and in gametes at the end of Meiosis 2.
Anaphase 1
- Paired homologs separate and move towards opposite poles of the cell.
Telophase 1
- Homologs complete their migration to cell poles.
- The cell undergoes cytokinesis, resulting in the formation of two daughter cells.
- Daughter cells are now in a haploid state.
End Result of Meiosis 1
- Each daughter cell receives one chromosome from each homologous pair.
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