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Modern Genetic Analysis Glossary
Z
zygote The cell formed by the fusion of an egg and a sperm; the unique diploid cell that will divide mitotically to create a differentiated diploid organism.
zygotic induction The sudden release of a lysogenic phage from an Hfr chromosome when the prophage enters the F cell, and the subsequent lysis of the recipient cell.
zygotically acting gene A gene whose product is expressed only in the zygote and not included in the maternal contribution to the oocyte.
zymogen The inactive precursor form of an enzyme. Zymogens are typically activated by proteolytic cleavage.

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