A) Zygotene
B) Leptotene
C) Metaphase
D) Pachytene
Correct Answer: A
Solution :
Prophase-I of meiosists-I is consists of five phases: Leptotene : In this phase chromatin fibres condense and form chromosomes. Zygotene : In this phase homologous chromosomes join laterally to form four stranded structure known as bivalent and this process known as synapsis. Pachytene : Crossing over between non-sisters chromatids of homologous chromosomes takes place in pachytene phase. Diplotene : Chiasmata is formed,chiasmata is the points of attachment between non-sister chromatids of two homologous chromosomes. (e) Diakinesis :Chiasmata shift towards the chromosome ends. This process known as terminalisation.
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