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Answer:
III. Condensation of chromosomes begins.
I. Synapsis occurs.
II. Crossing-over is completed.
IV. Separation of homologous chromosomes begins
Explanation:
The prophase I of meiosis I begins with the condensation of chromosomes. The process of compaction makes the individual chromosomes visible and the stage is called leptotene.
Leptotene is followed by zygotene of prophase I during which the homologous chromosomes are paired together. The process is mediated by the synaptonemal complex. As the homologous chromosomes are paired, each pair is visible as a tetrad as each of the chromosomes of a pair has two sister chromatids.
The exchange of part of chromatids occurs during crossing over. Crossing over is the event of the pachytene stage of prophase I. After crossing over, the homologous chromosomes begin to separate from each other during diplotene but stay paired at the points of crossing over. These points are called chiasmata. Diakinesis of prophase I is marked by the dissolution of chiasmata.
Cell division can be of two types mitotic or meiotic division. Meiosis is a reduction division in which chromosomes number gets halved in parental cells to produce four gametes.
This type of division occurs in the reproductive cells of an organism. For example sperm cells and eggs.
The correct order of the events are:
III. Condensation of chromosomes begins.
I. Synapsis occurs.
II. Crossing-over is completed.
IV. Separation of homologous chromosomes begins.
Explanation for the correct order:
- Meiosis occurs in two stages: meiosis 1 and meiosis 2. In meiosis, there is a separation of homologous chromosomes and the cell reduces to the haploid stage.
- The first stage of meiosis 1 is prophase 1, in which DNA and protein condense to form chromosomes.
- The homologous chromosome then forms synapses and the paired chromosome are called bivalents.
- In the pachytene stage of prophase 1 crossing over takes place in the part of chromatids.
- At the diplotene stage of prophase separation of homologous chromosomes begins and at the end of the stage called diakinesis, the chiasmata dissolve.
Therefore the correct order of events in meiosis is divided into stages leptotene, zygotene, pachytene, diplotene, and diakinesis.
To learn further about meiosis follow the given link:
https://brainly.com/question/10621150
