Quanitative Genetics

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  • Created by: Jess
  • Created on: 17-05-13 12:39

Quantitative Traits

Mendelian traits are caused by alleles of a single gene whereas multifactorial or quantitative traits are affected by multiple genes and/or the environment.

The pattern of variation shown by these traits is continuous giving a bell-shaped normal distribution.

Sources of quantitative variation:

- Genotype: alleles of two or more different genes contribute to the phenotype.

- Environment: factors may include nutrition, sunlight, rainfall and density of organisms.

- Genotype-environment interaction: most common cause, seen in humans in the way genotype and nutrition contribute to body height.

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