In the quadratic trend model, 
,which coefficient determines if the trend is going to be U-shaped or inverted U-shaped?
Definitions:
Mutation Rate
The frequency at which new genetic mutations occur in a given genome over a specified time frame.
Polyphenic Traits
Traits that exhibit several phenotypic expressions depending on environmental or genetic factors.
Phenotypic Plasticity
The skill of an organism to adjust its phenotype in accordance with changes in its surroundings.
Genetic Polymorphism
The existence of two or more distinct alleles at a given locus in a population’s genome.
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