Phenotype
Genotype and the environment affect the phenotype of an individual
Experiences in our lives and daily activities influence our phenotypes; nutrition, exercise, intelligence, sun tanning…
Genotype is not associated with a define phenotype, instead it is associated with a range of phenotypic possibilities due to environmental influences
The phenotypic range is called the norm of reaction for a genotype
In the norm of reaction the environment influences phenotypic expression
Are characters that have their phenotypes influenced by a combination of genetic and environmental factors
Phenotypes produced by most genes and alleles are strongly influenced by the physical environment. This can be shown in the genetic disease, phenylketonuria (PKU).
The amino acid Phenylalanine accumulates in the body, resulting to the poor development of the nervous system and profound (showing) mental retardation.
If a low-phenylalanine diet is taken, individuals will develop normally.
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