For most traits in populations both V G and V E contribute to the Total Phenotyp

Question

For most traits in populations both VG and VE contribute to the Total Phenotypic Variance (VP) for a trait in a population. The fundamental equation of quantitative genetics for a trait in a population is VP =VG + VE .

Describe the conditions (genetic and environmental) when:

            i. VP > 0 and VG = 0, ii. VG = 0 and VE = 0, iii VP > 0, VG > 0, and VE > 0.

            For example for i. VP > 0 and VG = 0 means that there is phenotypic variation for the trait in the population but that none of the variation is due to genetic differences among individuals. This means that all of the individuals in the population are the same genotype for the genes affecting the trait, and therefore have the same G value. Therefore, all of the phenotypic variation observed is due to environmental variance, VE.

Explanation / Answer

1. According to given situation phenotypic variation is totally due to environmental effect.

2. There is no variation in the phenotype of a population because there is no contribution of environmental factors or Gentics factors .

3. Phenotypic variation in a population is due to the contribution of both , Genetic or environmental . But here we can't define there contribution degree .

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