7.2 Complex Patterns of Inheritance KEY CONCEPT Phenotype is affected by many different factors.

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7.2 Complex Patterns of Inheritance KEY CONCEPT Phenotype is affected by many different factors.

7.2 Complex Patterns of Inheritance Phenotype can depend on interactions of alleles. In incomplete dominance, neither allele is completely dominant nor completely recessive…..is blended. –Heterozygous phenotype is intermediate between the two homozygous phenotypes –Green x purple = blue

7.2 Complex Patterns of Inheritance Codominant alleles will both be completely expressed. –Codominant alleles are neither dominant nor recessive. –The ABO blood types result from codominant alleles –Stripes, dots, roan colored horse are examples too. Multiple Alleles Many genes have more than two alleles.

7.2 Complex Patterns of Inheritance Many genes may interact to produce one trait. Polygenic traits are produced by two or more genes –Example: eye color, hair color, etc. Order of dominance: brown > green > blue.

7.2 Complex Patterns of Inheritance An epistatic gene can interfere with other genes and overshadows all other genes for a particular trait.

7.2 Complex Patterns of Inheritance The environment interacts with genotype. Height is an example of a phenotype strongly affected by the environment. The sex of sea turtles depends on both genes and the environment Phenotype is a combination of genotype and environment.