Sources of Genetic Variation
1) Crossing Over
- During prophase I
- Chromosomes condese
- Homologous pairs become bivalent - synapsis
- Chromatids in bivalent join at chiasmata
- Parts of chromosome are exchanged at chiasmata
2) Independent Assortment
- During metaphase I
- Homologous pairs arrange themselves radomly at equator of spindle
3) Random fusion of gametes
- Diploid chromosome number restored when nuclei of haploid gametes fuse
- Forms zygote
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