A threshold trait in livestock is one that is:
Correct answer: C. Expressed in categories after an underlying liability passes a threshold
- A. Measured only on a continuous numerical scale
- B. Controlled by one gene with no environmental influence
- C. Expressed in categories after an underlying liability passes a threshold
- D. Observed only when both parents show the same phenotype
Explanation
Threshold traits have an underlying continuous liability, influenced by genes and environment, but the observed outcome is categorical. Examples include survival, disease status, and whether dystocia occurs.
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Covers genes, chromosomes, inheritance, genetic variation, mutations, heritability and quantitative traits in livestock. It also includes selection methods, breeding systems, inbreeding, crossbreeding, heterosis and evaluation of traits such as growth, milk yield, fertility and disease resistance.
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