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Exceptions to Mendel’s laws

Exceptions to Mendel’s laws. 1) Incomplete dominance. Some alleles are not completely dominant and the offspring will have a “blending” of the parents traits. EX: Red flower x White flower  Pink flowers. Incomplete dominance. 2) Codominance.

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Exceptions to Mendel’s laws

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  1. Exceptions to Mendel’s laws

  2. 1) Incomplete dominance Some alleles are not completely dominant and the offspring will have a “blending” of the parents traits. EX: Red flower x White flower  Pink flowers

  3. Incomplete dominance

  4. 2) Codominance 2 alleles are equally dominant and both are expressed in the offspring. EX: Roan horses and cows really have white & red hair (they appear brownish). Both hair colors show up when a white horse is bred to a “red” horse.

  5. Codominance

  6. 3) Multiple Allele Traits A trait that has more than just 2 types of alleles. EX: human blood types** (also show codominance)

  7. Multiple allele traits

  8. 4) Polygenic Traits A trait that is controlled by more than 1 gene. EX: human skin color, height, and eye color

  9. 5) Sex linked traits (X-linked) Some traits are found on the sex chromosomes instead of autosomes and are more likely to show up in one gender. EX: colorblindness & hemophilia **these traits generally affect males more than females.

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