There are 4 exceptions to Mendel's principles. The first is incomplete dominance.
Incomplete dominance occurrs when some alleles are neither dominant or recessive. Often times they blend together. Think of paint mixing!
The second is codominance. Codominance is where both traits are shown in an organism. Remember a tabby cat, as it has both brown and white fur.
The third exceptation occurs with multiple alleles. This is where many genes exist in different forms and have multiple alleles. This occurs most prevalently in blood types.
The last exception is polygenic traits. This is where many traits are produced by the interaction of several genes. Think skin tone or eye color!
Environmental conditions can also affect gene expression and influence genetically determined traits.
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