Meiosis in spermatogenesis proceeds in several stages (phases). There are two interphases between divisions. Thus, meiotic division can be represented as a series of events following one after another, namely: interphase I first meiotic division (early prophase I, late prophase I, metaphase I, anaphase I, telophase I) interphase II (interokinesis) second meiotic division (prophase II, metaphase II, anaphase II, telophase II). The meiosis process is very dynamic, so the microscopic differences between the different stages do not reflect the nature of the stages themselves, but rather the properties of the chromosomes at different stages. Interphase I is characterized by the fact that chromosome replication occurs (DNA doubling), which almost completely ends by the beginning of early prophase I .
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