A gene that is lethal (fatal) for the zygote, the
cell formed by the union of a sperm (male sex cell) and an ovum (female sex cell).
The zygote would normally develop into an embryo, as instructed by the genetic material
within the unified cell. However, a zygotic lethal gene scotches prenatal development
at its earliest point.
A zygotic lethal gene is a mutated (changed) version of a normal gene essential
to the survival of the zygote. The extent of the mutation can range from a change
in a single base in the DNA to deletion (loss) of the entire gene.
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