What molecular conformation (structure) of homologous chromosomes facilitates crossing over? tetrad meiosis ii triads mitosis

The molecular conformation that facilitates crossing over is: tetrad.

Homologous chromosomes form tetrads composed of four sister chromatids. These chromatids are then able to cross over.

This happens during the stage of Meiosis I - in Meiosis II the tetrad has already split into pairs of sister chromatids.

from the original order (top to bottom) the new order will go

1 (founder)

4 (hawk)

2 (mutate)

3 (next generation)