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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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section 12 2

Section 12-2

When Heredity Follows Different Rules

incomplete dominance
Incomplete Dominance
  • The phenotype of the heterozygote is in between the two homozygotes.
    • RR – Red flowers
    • rr – white flowers
    • Rr – pink flowers
codominance
Codominance
  • Causes the phenotype of both homozygotes to be produced in heterozygous individuals.
    • Ex: Checkered chickens
multiple alleles
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
multiple alleles continued
Multiple Alleles Continued
  • Blood Type in Humans
    • IAIA or IAi – A
    • IBIB or IBi – B
    • IAIB – AB
    • ii - O
sex linked inheritance
Sex-linked Inheritance
  • Traits controlled by genes located on the sex chromosome (X).
    • Ex: Colorblindness and hemophilia