prophase I
significantly lengthened comparing to mitosis prophase
leptotene（细线期）
chromosome condense, but two sister chromatids do not separate
子主题
string-like chromomere（染色粒）
telomere connected with nuclear envelope
also called the "bouquet stage"
zygotene（偶线期）
homologous chromosome paring with each other (synapsis，同源染色体联会)
connected by synaptonemal complex（联会复合体）
formation of tetrad（四分体）
0.3% DNA synthesis (zygDNA)
pachytene（粗线期）
chromosome shortened and thickened
DNA crossing-over
at recombination nodules（重组节）
which is part of SC
P-DNA synthesis, which codes enzymes for DNA splicing and repairing
synthesize specific meiotic histones
diplotene（双线期）
SC dissolution, homologous chromosomes repelling
homologous chromosomes connected at chiasma（交叉点）
chiasma maintained by cohesin
灯刷染色体
diakinesis（终变期）
chiasma reduces
nuclear envelope disassemble
formation of meiotic spindle
tetrads move to the metaphase plate
metaphase I
tetrads positioned at metaphase plate
sister chromatids connected with MT from the same pole
anaphase I
separation of homologous chromosomes, moving two both poles
telophase I
chromosomes positioned at poles
chromosomes decondensed, but not fulled dispersed
nuclear envelope may or may not assemble
