Publisher Summary This chapter illustrates the development of genetic differences that lead
to hybrid inviability. It is pointed out that the species level of divergence can be reached with�…

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The importance of nucleocytoplasmic interactions in early development is illustrated by the
embryonic lethality of many hybrid combinations between species. In order to investigate�…

Rana esculenta Linnaeus is a hybrid between R. ridibunda Pallas and R. lessonae
Camerano. Diploid individuals usually occur in populations with R. lessonae (LE system)�…

Publisher Summary This chapter discusses the nucleocytoplasmic interactions in
development of amphibian hybrids. The results of the investigations on lethal anuran and�…

Sympatric congeneric anurans exist together under systems of adjustment to coexistence of
their populations, systems that reflect a past history of the populations under allopatry and�…

MATERIALS AND METHODS Rana pipiens from the following localities have been used in
hybridization experiments: Alburg, Vermont; Oshkosh, Wisconsin; Mt. Ephraim, New Jersey;�…

From literature data on 116 taxa crosses involving 46 species of frogs, we found a positive
correlation between degree of divergence (measured as Nei's genetic distance, D) and�…

Method Nuclear transplantation is in effect a means of replacing the zygote nucleus of a
fertilized egg by an embryonic cell nucleus. The principle of the method is shown�…

The characteristic spotting pattern of the wild-type leopard frog, Rana pipiens, is the
manifestation of a main spotting locus operating in concert with an integrated system of�…