From Z to A: ZYGOTENE

ZYGOTENE, according to the Official Scrabble Dictionary, is "a stage in MEIOSIS."

MEIOSIS is a stage in cell division, which takes place during sexual reproduction.

In the ZYGOTENE stage, which cna be pluralized ZYGOTENES, the chromosomes are pairing together.

The prefix "zygo" comes from the Greek for YOKED.

Remember that "zymo" is from the Greek for LEAVEN.

So there is ZYMOGENE, menaing "a substance that develops into an ENZYME when suitable activated"/

And there is ZYGOTENE, which is the stage in MEIOSISI where cells begin to line up in pairs, to be YOKED.