Chiasmata is the X-shaped structure formed due to the point of contact between paired chromatids during meiosis. It is the point representing the crossover where the homologous chromosomes are joined to each other.
Significance.- At chiasmata crossing over occurs in pachytene stage. The crossing over brings variations which are raw material of evolution.
Namethe five phases of of Prophase I.
The five phases of prophase 1 are i. Leptotene ii. Zygotene iii. Pachytene iv. Diplotene v. Diakinesis.