Mention the sub stages of prophase-1 in meiosis-1
Answers
sub stage of prophase1 :-
1. Leptotene- Formation of chromosome take place . Chromosome seems single stranded and clearly visible under microscope.
2. Zygotene- Homologous chromosome are present in pair are called bivalent or tetrad . The process of formation of pairs of homologous chromosomes . Chromosome start pairing together and this process or association is called synapsis.
3. Phacytene- Bivalent convert into tetravalent in which each chromosome of the pair divide into sister chromatid . But both sister chromatid remain attached at the centromere . Coiling occur between two non sister chromatid of homologous chromosome and thus crossing over takes place.
4. Diplotene- Opening of coiling occur in between non sister chromatid . At some place in pair X shaped connection occur between non sister chromatid called as chiasma . Number of chiasma in one pair of chromosome may be from one to numerous.
5. Dikinesis- It is the last stage of prophase 1 . In this stage both non sister chromatid of the pair of chromosomes get seprated from each other by terminalisation process . In this process chiasma moves toward the terminal end of the chromosomal arms and finally both non sister chromatid are seprate.