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Missing upper beak: a new lethal mutation in domestic fowl
The Journal of Heredity
|July 1, 1982
Summary
A newly identified genetic mutation in domestic fowl, missing upper beak (mub), causes lethal facial deformities. This autosomal recessive condition prevents beak and eyelid development, leading to embryonic or hatching mortality.
Area of Science:
- Genetics
- Developmental Biology
- Avian Science
Background:
- Facial structure development in domestic fowl is crucial for survival.
- Genetic mutations can lead to severe developmental abnormalities.
Purpose of the Study:
- To describe a novel genetic mutation affecting facial development in domestic fowl.
- To characterize the phenotypic effects and inheritance pattern of the missing upper beak mutation.
Main Methods:
- Observation and description of a new condition in domestic fowl.
- Genetic analysis to determine inheritance pattern (autosomal recessive, complete penetrance).
- Phenotypic characterization of affected embryos and hatchlings.
Main Results:
- A new mutation, missing upper beak (mub), is described, controlled by an autosomal recessive gene.
- The condition is an obligate lethal, with mortality occurring around day 12 of incubation or during hatching.
- Key phenotypic effects include absence of the upper beak and eyelids, with reduced premaxilla and nasal bones.
Conclusions:
- The mub mutation results in severe facial malformations, including the absence of the upper beak and eyelids.
- This mutation is an obligate lethal, likely due to developmental defects in membrane formation during embryogenesis.
- Understanding such mutations provides insights into avian facial development and genetic control mechanisms.