Genotype x Environment Interaction

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5 Terms

1
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What is genotype x environment interaction (GEI)?

A situation where different genotypes respond differently in different environments

2
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When is there no GEI?

IF G and E act independently

3
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How is GEI different from correlation between genotype and environment (rGE)?

Because rGE refers to non-random association between certain genotypes and environment

  • Not because of the genotype’s performance but because of how the environment is assigned

  • EX: high producing cows receive more feed

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What are the 2 effects when GEI is present

  • Scaling Effect

    • Ranking of genotypes stays the same across environments

    • BUT performance differences differ depending on the environment

  • Re-Ranking of Genotypes

    • Genotypes perform differently in each environment that the ranking changes

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How to reduce the negative effects of GEI? (animals perform very differently in different environments)

  • Breeders can crossbred because crossbred/hybrids tend to be more robust and show heterosis (hybrid vigour)

  • So they have greater adaptability to a variety of environments