a. Synaptonemal complex

• Formed during zygotene a sub stage of Prophase I.

• Made up of protein, formed between two homologous chromosomes.

• It contains a recombination nodule which consists of enzyme recombinase involved in crossing over.

b. Metaphase plate

• It is an imaginary line, located in the centre of the cell.

• Formed during metaphase.

• The chromosomes gets attached to the spindle fibre and aligns themselves on the plate.

• The movement of chromosomes toward the metaphasic plate is called congression.