Maternal Thp lethality in the mouse is a nuclear, not cytoplasmic, defect.

Abstract excerpt

The Thp mutation, an allele of the mouse T/t complex, differs from other known mutations in that its effects are determined by the sex of the parent from which it is inherited; when inherited from the female parent, it is invariably lethal at the embryonic stage, but, most embryos which inherit the mutation from the male parent survive. Thus most heterozygous embryos carrying the maternally derived mutation die...

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