Polygenic and Multifactorial Traits
Polygenic traits reflect the activity of more than one gene, and multifactorial traits are also influenced by the environment.
Twins Because twins have identical or similar genes, it is easy to determine what traits are influenced by the environment. | DZ Twins
MZ Twins
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Schizophrenia
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Symptoms: hallucinations, delusions, thought disorders, movement disorders
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Environmental factors: prenatal exposure to viruses & malnutrition before birth
Multifactorial Traits
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