Question

Defferentiate between leptotene and zygotene

Answer 1

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Answer 2

Answer :-

Leptotene :-

• The "Leptotene" stage in meiosis is a stage in which the chromosomes present inside the cell, appear as thin long threads.

• In the "Leptotene" stage, the chromosomes tend to attain a bead like body structure.

• The bead like structural appearance of the chromosomes is mainly due to the presence of "Chromomeres" in the "Leptotene" stage.

Zygotene :-

• The "Zygotene" stage in meiosis is a stage in which the process of "Synapsis" takes place.

• "Synapsis" is the process through which the pairing of homologous chromosomes occurs.

• "Synapsis" results in the formation of "Bivalents" during the Zygotene stage.

Extra Information :-

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• The process of pairing of chromosomes is highly specific, involving the formation of a special protinaceous structure called the "Synaptonemal complex" (S.C.).

• The "Synaptonemal complex" (S.C.) is formed during the Zygotene stage only.

• The "Synaptonemal complex" (S.C.) is associated with the pairing of meiotic chromosomes.

• The processors of "Genetic recombination" between two homologous chromosomes is facilitated by the "Synaptonemal complex" (S.C.)