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A cross between two distinct, true-breeding plants of Antirrhinum majus L. showed an unexpected pattern of inheritance of growth habit in the F2, which was extended to both growth habit and leaf shape in the F3 generation of all the plants traced further. All the F3 families, offspring of individual F2 plants, were very uniform for both growth habit and leaf shape traits but differed distinctly from each other in these respects. The backcrosses of selected F3 and F4 families to the original parents in the cross did not segregate for the distinctive family phenotypes. This led to the postulate that a cytoplasmic factor was involved in the regulation and/or integration of genetic information concerned with growth habit/leaf shape. The similarity of the reciprocal backcrosses of the F3 and F4 families led to the further postulate that the proposed cytoplasmic factor was specified by both the maternal and paternal parents to a similar degree. That the gene component was segregating normally was shown by the inheritance of four marker genes for flower colour, colour pattern and flower shape.

Evidence for cytoplasmic inheritance of a developmental organizer affecting growth habit and leaf shape in Antirrhinum majus