PinkMonkey Online Study Guide-Biology|
Figure 6.5 (A) Various stages in Meiosis--I
The various events in M-I are classified into Prophase-I, Metaphase-I,
Anaphase-I and Telophase-I. The important features in each phase
are described in brief.
Prophase-I : This is the longest phase in meiosis and involves some very important events. Prophase-I is sub-divided into five stages (a) Leptotene (b) Zygotene (c) Pachytene (d) Diplotene and (e) Diakinesis.
(a) Leptotene (Leptonema) : Chromosomes become visible as long slender threads bearing numerous bead-like nucleosomes (chromomeres). These are arranged in a linear fashion along their lengths. The nuclear envelope and the nucleolus are prominently visible. The thin chromosomes are scattered in the nucleus.