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KEY CONCEPT Phenotype is affected by many different factors.

This concept highlights the complexity of phenotype determination, discussing the influence of allele interactions, dominance patterns, and the role of the environment. It explores phenomena like incomplete dominance, codominance, polygenic traits, and the interaction between genes and the environment.

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KEY CONCEPT Phenotype is affected by many different factors.

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  1. KEY CONCEPT Phenotype is affected by many different factors.

  2. Phenotype can depend on interactions of alleles. • In incomplete dominance, neither allele is completely dominant nor completely recessive. • Heterozygous phenotype is intermediate between the two homozygous phenotypes • Homozygous parental phenotypes not seen in F1 offspring

  3. Codominant alleles are neither dominant nor recessive. • The ABO blood types result from codominant alleles. • Codominant alleles will both be completely expressed. • Many genes have more than two alleles.

  4. Order of dominance: brown > green > blue. Many genes may interact to produce one trait. • Polygenic traits are produced by two or more genes.

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

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