A lethal mutation in Dark Cornish fowl
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Shortness of the extremities in Dark Cornish fowls appears to be determined by several genetic factors, probably more than one of these being dominant over the long-legged condition. In short-legged Cornish tibia and tarsometatarsus are most strikingly shortened. The fibula is better developed than in ordinary chickens. One of the factors concerned in shortening of the long bones is lethal in homozygous condition. The lethal embryos die just before the end of the incubation period or are still living at hatching time but are unable to hatch. They show a striking shortening of the extremities. This lethal mutation is genetically independent of the Creeper mutation.
KeywordsHomozygous Condition Lethal Mutation Lethal Embryo Incubation Data Lethal Type
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