Genetic and environmental variation
[DOC File]Module 2 Variation - Lagan Biology Department
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IF all phenotypic variation is the result of genetic differences and none is due to environment, trait is 100% heritable: VE = 0, so h2 = VG/VG = 1. OR IF none of variation is due to genetic differences, trait is 0% heritable: VG = 0, so h2 = 0/(0 + VE) = 0. But, variation in a trait often falls somewhere between those two extremes.
Difference Between Genetic Variation and Environmental Variation …
Continuous variation is caused by environmental variation and genetic variation due to the simultaneous segregation of many genes affecting the trait. These effects convert the intrinsically discrete variation to a continuous one. Biometric genetics is used to distinguish between the two factors that cause continuous variability to occur.
[DOC File]HERITABILITY AND GENETIC CAUSATION
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Environmental Influences causing variation. What environmental factors can affect variation? _____ Variation may be a result of a combination of both genetic and environmental conditions. An individual may have inherited the genetic information for a particular characteristic but environmental factors may affect the expression of that ...
[DOCX File]Chapter 8 from Principles of plant genetics and breeding
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The triggering causes in the context of heritability analysis are genes or genetic variation (and environment or environmental variation). These are assumed to be relevant causal factors. Whether these are valid causal factors or categories can be discussed, …
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