Abstract
Matings of Triturus cristatus carnifex consistently produce two embryonic lethal phenotypes (fat-tailed and slim-tailed) and viable larvae in the 1:1:2 proportions expected for a balanced lethal system. A marker variant of chromosome 1 is used to show fat-tailed embryos are 1A/1A homozygotes, slim-tailed embryos are 1B/1B homozygotes and viable ones are 1A/1B heterozygotes. Another embryonic trait (dorsal blisters), which is expressed in the lethal phenotypes of some matings, is found to be incompletely linked to the recessive lethal factors.
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Wallace, H. The balanced lethal system of crested newts. Heredity 73, 41–46 (1994). https://doi.org/10.1038/hdy.1994.96
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DOI: https://doi.org/10.1038/hdy.1994.96
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