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Fig. 1. Diploid hybrid experiments. In all cases the eggs were from Vermont. The sperm were from the various localities shown by the letters. The letters A-F give the degree of defectiveness of the embryos. A is normal development equal to that of the diploid controls (both egg and sperm from Vermont). F is an embryo that ceases development at the beginning of gastrulation. The scale is described fully in Moore (1967a). The various species of the Rana pipiens, complex as recognized by Pace (1974), together with their ranges, are shown.
Fig. 2. Haploid hybrid experiments. The enucleated eggs were all from Vermont. The sperm were from the various localities shown by the numbers. The numbers give the degree of defectiveness of the embryos. 1 is development equal to the haploid controls (enucleated Vermont egg fertilized by a Vermont sperm). 6 is an embryo that ceases development at the beginning of gastrulation. This scale is fully described in Moore (1967a). The various species of the Rana pipiens complex, as recognized by Pace (1974), together with their ranges, are shown. |
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