Three events are unique to meiosis.
In prophase I
duplicated homologous xs line up & become physically connected along their lengths--synapsis
Genetic rearrangement between non sis chtds--crossing over.
-- four chtds of a homologous pair Chiama--the "x-shaped" region formed by tetrad. The physical manifestation of crossing over. 2. Tetrads on the metaphase plate -- at metaphase I, chromosomes line up on the metaphase plate as homologous pairs (tetrads), rather than individual replicated chromosomes, as in mitosis. 3. Separation of homologues-- at anaphase I of meiosis, the duplicated chromosomes of each homologous pair move toward opposite poles, but the sis chtds of each duplicated chromosome remain attached. In mitosis, sister chtds separate.