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Bellringer (Week 3)

Bellringer (Week 3). Bellringer cont. Section 12-2. When Heredity Follows Different Rules. Incomplete Dominance. The phenotype of the heterozygote is in between the two homozygotes. RR – Red flowers rr – white flowers Rr – pink flowers. Codominance.

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Bellringer (Week 3)

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  1. Bellringer (Week 3)

  2. Bellringer cont.

  3. Section 12-2 When Heredity Follows Different Rules

  4. Incomplete Dominance • The phenotype of the heterozygote is in between the two homozygotes. • RR – Red flowers • rr – white flowers • Rr – pink flowers

  5. Codominance • Causes the phenotype of both homozygotes to be produced in heterozygous individuals. • Ex: Checkered chickens

  6. Multiple Alleles • Traits controlled by more than two alleles • Coat color in rabbits • C (dark grey) – dominant to all other alleles • Cch (Chinchilla) – dominant to Himalayan and white • Ch (himalayan) – dominant to white • c (white) - recessive

  7. Multiple Alleles Continued • Blood Type in Humans • IAIA or IAi – A • IBIB or IBi – B • IAIB – AB • ii - O

  8. Sex-linked Inheritance • Traits controlled by genes located on the sex chromosome (X). • Ex: Colorblindness and hemophilia

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