Bead-like thickened portions of leptotene chromosomes are
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Prophase I is divided into five sub-phases: leptotene, zygotene, pachytene, diplotene and diakinesis.
Stages of Prophase. Prophase I is divided into 5 distinctive sub-stages: Leptotene – The chromosomes begin to condense and are attached to the nuclear membrane via their telomeres. Zygotene – Synapsis begins with a synaptonemal complex forming between homologous chromosomes.
Pachytene. ... During pachytene the homologous chromosomes thicken and become recombinant. Crossing over of segments of genetic information occurs between non-sister chromatids of homologous chromosomes, forming exchange sites called chiasmata and resulting in recombination.
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