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Which one of the following is correctly matched?
Option: 1
Leptotene - formation of bivalents
Option: 2
Diplotene - chiasmata appear
Option: 3
Pachytene - chiasmata terminalisation
Option: 4
Zygotene - formation of bouquet
Answers (1)
Stages of Meiosis ? - Prophase I -
Stages of Meiosis ? - Prophase I
- In meiosis I, the actual reduction in the number of chromosomes occurs.
- It starts after the homologous chromosomes have replicated during S-phase and the proteins required for division have been synthesized in G2 phase.
- Therefore, it occurs after the interphase of cell cycle.
- It is studied under Prophase I, Metaphase I, Anaphase I and Telophase I.
Prophase I
- It is the longest phase of meiosis I.
- It is divided into five substages: leptotene, zygotene, pachytene, diplotene and diakinesis.
ZYGOTENE:
- The pairing of the homologous chromosomes initiate in this phase.
- The pairing of homologous chromosomes is called synapsis.
- The synapsed homologous chromosomes appear in the form of bivalent of chromosomes or tetrad of chromatids.
- In the tetrad, two similar chromatids of the same chromosome are called sister chromatids and those of two homologous chromosomes are termed non-sister chromatids.
- A filamentous ladder like nucleoproteins complex, called synaptonemal complex appears between the homologous chromosomes. It holds the homologous chromosomes together.
-
Formation of bivalents occurs during zygotene. Chiasmata terminalisation occurs during diakinesis. Formation of bouquet occurs during leptotene.
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