Pachynema (pachytene) is the phase where the fully formed synaptonemal complex is prominently observed during prophase-I of meiosis.​

Option Breakdown

Leptonema

Leptonema (leptotene) features chromosome condensation into thin threads with visible chromosome ends (bouquet stage); no synaptonemal complex forms yet.​

Zygonema

Zygonema (zygotene) initiates homologous chromosome pairing (synapsis) where synaptonemal complex begins assembling at multiple points.​

Pachynema

Pachynema shows complete synaptonemal complex formation between all homologous chromosome pairs, enabling crossing over; visible under electron microscopy.​

Diplonema

Diplonema (diplotene) marks synaptonemal complex disassembly as homologs separate except at chiasmata, revealing recombination sites.​

Introduction

The synaptonemal complex is observed in Pachynema phase of prophase-I meiosis among Leptonema, Zygonema, and Diplonema, crucial for genetic recombination.​

Prophase-I Stages Overview

Prophase-I divides into five substages where the synaptonemal complex progressively assembles during Zygonema and matures fully in Pachynema for crossover formation.​

Meiosis Stage Comparison