Why prophase 1 is considered to the largest phase? explain Diagram
Answers
Answer:
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Explanation:
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Prophase I is the longest phase of meiosis and is further sub divided into 5 phases:
Leptotene : Condensation makes chromosomes become distinct and compact.
Zygotene : Homologous chromosome start pairing together by a process called synapsis to form a complex structure called synaptonemal complex. Two synapsed homologous chromosomes form a complex called bivalent or tetrad.
Pachytene : Longest phase of prophase I
Recombination nodules appear in this stage at the sites where crossing over has to take place between non-sister chromatids of homologous chromosomes.
Diplotene : Synaptonemal complex dissolves and recombinants separate from each other except at crossover sites to form X-shaped structure called chiasmata.
Diakinesis : Chiasmata terminalises and chromosomes condense. Meiotic spindle assembles and nucleolus and nuclear envelope disappear.
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