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Updated: May 31, 2025
Or it might be somehow due to what Morgan and his colleagues have called crossing over in the segregation of heterozygous chromosomes, so that a part corresponding to a sinistral body is united with a part corresponding to a dextral head. My conclusion from the evidence is that any process of congenital development may in particular zygotes exhibit a mutation, a departure from the normal.
On the outer surface this bowl has a row of tadpoles encircling it in a sinistral direction, or with the center of the bowl on the left. The design of figure c shows a bird's head in profile, with a crest of feathers and with the two eyes on one side of the head and a necklace. The triangular figure bears the symbolism of the turkey feather, as at present designated in Tusayan altar paraphernalia.
On this last hypothesis the mutation here considered might be a heterozygous specimen, with the dextral condition dominant in the head and the sinistral in the body.
Shell spiral, turbinate, dextral, imperforate, spirally ridged or double-keeled and transversely wrinkled; spire prominent, its nucleus sinistral; aperture ovate, canaliculated below, its outer margin furnished with two claw-like lobes, the one central and formed by a prolongation of the margin between the keels of the body whorl, the other smaUer and nearer the canal; peristome thickened, reflexed, forming a conspicuous margin.
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