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1/12/15 Objective: What factors influence typical inheritance Do Now: Take out your HW genetics problems.

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Presentation on theme: "1/12/15 Objective: What factors influence typical inheritance Do Now: Take out your HW genetics problems."— Presentation transcript:

1 1/12/15 Objective: What factors influence typical inheritance Do Now: Take out your HW genetics problems

2 Multiple Alleles -More than one allele controls a trait (ex: blood type) -Blood types: A, B, AB, or O Allele O is recessive Phenotype (Blood Type) Genotypes OOO AAA or AO BBB or BO AB

3 Codominance -A heterozygote expresses BOTH traits (ex: AB = Blood type AB) Phenotype (Blood Type) Genotypes OOO AAA or AO BBB or BO AB Allele O is recessive

4 What is the genotypic ratio of the offspring if you cross a man who is heterozygous for type A blood and a female who is homozygous for type O blood?

5 Polygenic Inheritance -When two or more genes affect a single trait (ex: skin color, eye color)

6 Influence of the Environment -Ex: exercise on weight, amount of sun on skin color

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