Podcast
Questions and Answers
The phenotype of an animal for a quantitatively inherited character is determined by?
The phenotype of an animal for a quantitatively inherited character is determined by?
What does genotype refer to?
What does genotype refer to?
Group of animals (breed, line, strain or family) whose genetic composition is similar, but not necessarily identical
When is there a genotype-environment interaction (GEI)?
When is there a genotype-environment interaction (GEI)?
When the difference in the performance of two different genotypes is different in two different environments
What factors contribute to genotype-environment interactions (GEI)?
What factors contribute to genotype-environment interactions (GEI)?
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What is genetic potential?
What is genetic potential?
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Discuss genotype-environment interactions and give examples.
Discuss genotype-environment interactions and give examples.
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Study Notes
Genotype-Environment Interaction
- Phenotype in animals for quantitatively inherited traits results from both genotype across multiple loci and environmental influences.
- Genotype is a group of animals (breed, line, strain, family) sharing similar, though not identical, genetic makeup.
When Genotype-Environment Interaction Occurs
- Genotype-environment interaction (GEI) occurs when performance differences between genotypes vary in different environmental contexts.
Factors Contributing to Genotype-Environment Interaction
- Genetic potential of diverse genotypes affects character performance and adaptation to different environments.
- Different genotypes’ adaptation levels influence how much of their genetic potential they can realize amid environmental challenges.
Genetic Potential Defined
- Genetic potential refers to the maximum performance achievable by an animal breed in optimal conditions without environmental stress.
Examples of Genotype-Environment Interactions
- GEI can manifest where the same genotype shows superior performance in different environments, but with varying degrees of superiority. For instance:
- Brahman-British F1 cows achieved calf crop percentages of 93% in Nebraska and 96% in Texas, with performance difference larger in Texas (9% vs 4%).
- Alternatively, performance may vary significantly between environments for different genotypes:
- Angus-Hereford F1 cows weaned a higher percentage of calf crops (85%) compared to Brahman-British F1 cows (82%) overall, but in Central Texas, Brahman-British F1s outperformed with 88% against 83%.
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Description
This quiz explores the concept of genotype-environment interaction (GEI) in animals, focusing on how both genetic makeup and environmental factors contribute to phenotype variations. Understand the implications of genetic potential and its influence on adaptation across different environments. Test your knowledge on the factors that lead to these interactions.
