Confirmation of gynogenesis in Phoxiinus eos-neogaeus (Pisces:Cyprinidae)

Article Abstract:

The majority of all-female species of fish, reptiles and amphibians developed as hybrids between congeneric bisexual species. Phoxinus eos-neogaeus, the all-female cyprinid species, can produce both genetically identical and unique diploid ova, leading to clonal and nonclonal offspring. Other females produce haploid eos ova, resulting in diploid P. eos offspring, when fertilized by P. eos sperm. Two females of P. eos-neogaeus were mated to a male of P. oreas, whose contribution to the offspring was observed through morphology, tissue graft analysis and genome size.

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Inheritance of body coloration in the lyretail toothcarp (Aphyosemion australe Cyprinodontidae)

Article Abstract:

The bodies of lyretail toothcarp exhibit two color phenotypes. The golden lyretail has a distinct orange color, while the common Aphyosemion is shaded brown. A study of lyretails in the laboratory supports the theory that complementary gene action controls the inheritance of body color. Details of the investigation are presented.

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Allozyme analysis of clonal diversity among unisexual hybrids of the killifishes Fundulus diaphanus and F. heteroclitus

Article Abstract:

Fundulus diaphanus and f. heteroclitus hybrids are diploid unisexual gynogens. Clonal diversity at two localities in Nova Scotia was examined using isozymes. ADA was found to be polymorphic in F. diaphanus but monomorphic in most of the hybrids, indicating low clonal diversity amongst hybrids.

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