• Incomplete Dominance  – One allele is not    completely dominant    over the other.  – Offspring shows    blending pheno...
Beyond Dominant and Recessive• Codominance    – Both alleles contribute to      the phenotype.    – Eg: Red cow X White   ...
Beyond Dominant and Recessive• Multiple Alleles                                            Full   – One gene have more tha...
• Polygenic traits  – Several genes control the    trait.  – Wide range phenotypes.  – Eg: Skin color, height
Beyond Dominant and Recessive• Sex linkage (x-linked)   – Some genes are present on the X     chromosome but missing on th...
Beyond Dominant and Recessive1)       Color blindness     –     more common in males           than in females.
Beyond Dominant and Recessive2) Haemophilia   – unable to clot blood
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  • It is defined generally as an even mixture of white and pigmented hairs that does not "gray out" or fade as the animal ages
  • The genotype AaBbCc would produce the same skin color as any other genotype with just three dark-skin alleles, such as AABbcc
  • A person with normal color vision can see more than 150 colors. In contrast, some one with red green color blindness can see fewer than 25. For some affected people, red appear grray, others see gray instead of green
  • 11 3

    1. 1. • Incomplete Dominance – One allele is not completely dominant over the other. – Offspring shows blending phenotype – Eg: White flower crosses with a red = pink flower.
    2. 2. Beyond Dominant and Recessive• Codominance – Both alleles contribute to the phenotype. – Eg: Red cow X White Cow = Roan Cow. – Eg: blood type I A IA IB IBgenotype or or I A IB ii IA i IB i phenotypephenotype A B AB O
    3. 3. Beyond Dominant and Recessive• Multiple Alleles Full – One gene have more than two alleles – Eg: Rabbit coat color, four alleles: • C > cch > ch> c – Eg: blood type, three alleles • IA = IB > i
    4. 4. • Polygenic traits – Several genes control the trait. – Wide range phenotypes. – Eg: Skin color, height
    5. 5. Beyond Dominant and Recessive• Sex linkage (x-linked) – Some genes are present on the X chromosome but missing on the shorter Y chromosome.
    6. 6. Beyond Dominant and Recessive1) Color blindness – more common in males than in females.
    7. 7. Beyond Dominant and Recessive2) Haemophilia – unable to clot blood

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