Meiosis Flashcards
What is the differences between mitosis and meiosis
Meiosis
- Only in gametes
- Recombination of genetic material (generates diversity)
- Two cell divisions
- 4 haploid daughter cells
Chromosomes condense
Prophase 1
Chromosomes pair up - aligns with the homologue partner. Pair up at the corresponding positions along their full length
Prophase 1
Crossing over. Helped by synaptonemal complex
Prophase 1
Homologue pairs (not individual chromosomes) line at the plate
Metaphase 1
Each chromosome attaches to microtubules from just one pole of the spindle
Orientation is random
Metaphase 1
Sister chromatids for each chromosome remain attached
Anaphase 1
Homologues pull apart
Anaphase 1
Chromosomes arrive at the end of poles
Telophase 1
Cytokinesis usually occurs now - forming two daughter haploid cells
Telophase 1
What is the separation which occurs during meiosis 1
Homologous pairs separate
What is the separation which occurs during meiosis 2
Sister chromatids separate
Remember this happens twice as meiosis has produced two cells
Centrosome move apart, spindle forms, spindle microtubules begin to capture chromosomes
Prophase 2
Two sister chromatids of each chromosome are captured by microtubules from opposite spindle poles
Prophase 2
Chromosomes line up individually along the metaphase plate
Metaphase 2