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Set up Cornell Notes on pg. 75 Topic: 7.2 Patterns of Inheritance Essential Questions :

7.2 Patterns of Inheritance. 2.1 Atoms, Ions, and Molecules. Set up Cornell Notes on pg. 75 Topic: 7.2 Patterns of Inheritance Essential Questions : Why might polygenic traits vary more in phenotype than do single-gene traits?

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Set up Cornell Notes on pg. 75 Topic: 7.2 Patterns of Inheritance Essential Questions :

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  1. 7.2 Patterns of Inheritance 2.1 Atoms, Ions, and Molecules Set up Cornell Notes on pg. 75 • Topic: 7.2 Patterns of Inheritance • Essential Questions: • Why might polygenic traits vary more in phenotype than do single-gene traits? • How is codominance the same as having no dominant and recessive relationship at all between 2 alleles? • Why might polygenic traits vary more in phenotype than do single-gene traits? • How is codominance the same as having no dominant and recessive relationship at all between 2 alleles? KEY CONCEPT Phenotype is affected by many different factors.

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

  3. + • What are our possible outcomes for this combination of flower color? • What if red nor white was dominant or recessive to one another?

  4. In incomplete dominance, neither allele is completely dominant nor completely recessive. • They are a BLEND of each other • Ex: red+white rose= pink rose BB RR BR

  5. B B BR BR R BR BR R Genotype: Phenotype: BR 100% pink flowers

  6. B R BB Red rose BR Pink rose B BR Pink rose R RR White rose Genotype: BB= red RR= white BR= pink Phenotype: 25%= red flowers 50%= pink flowers 25%= white flowers

  7. Codominant alleles are neither dominant nor recessive. • Codominant alleles will both be completely expressed. Ex: multi-colored red and white rose

  8. B B BR BR R BR BR R Genotype: Phenotype: BR 100% red and white flowers

  9. Polygenic traits are produced by two or more genes. • Can produce a continuous range of colors Ex: Skin color- 4 genes Eye color- at least 3 genes

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