Biology / Unit 5 Bio 0963 short lesson, about 20 seconds
Interphase Before Meiosis
Captions available
The idea
Meiosis is preceded by an interphase with G1, S, and G2 phases nearly identical to mitotic interphase, replicating each chromosome into two sister chromatids before division begins.
In practice
A diploid cell entering meiotic S phase copies every chromosome, so meiosis I begins with duplicated, not single, chromosomes.
Where people slip
The two meiotic divisions that follow share this one replication — neither division replicates DNA again.
Your place on the trail
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