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Inheritance, If the - Coggle Diagram

- - - - Yellow
      - Green
    - - Round
      - Wrinkled
    - - Green
      - Yellow
    - - Smooth
      - Constricted
    - - Tall
      - Dwarf
    - - Axial
      - Terminal
    - - Purple
      - White
- - - - Many of the alleles causing human genetic
        disease are recessive, like Cystic Fibrosis
      - some are dominant, like Huntington disease
      - Disease genes can also be found on the sex
        chromosomes
- - - - Recessive allele does not affect phenotype of
        heterozygote
      - Single copy of the dominant allele makes enough functional protein to provide a normal phenotype, masking recessive allele
      - sometimes heterozygote may even upregulate the one functional allele to provide high enough expression
  - - - Neither allele is dominant (both are expressed)
        
        Ex: the AB blood type
  - - - Can develop normally if given a diet free of
        phenylalanine
      - If diet contains phenylalanine, symptoms include mental retardation, underdeveloped teeth and foul-smelling urine
      - Example: Phenylketonuria (PKU) disease