Other Patterns of Inheritance

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.

Made with Adobe Slate

Make your words and images move.

Get Slate

Report Abuse

If you feel that this video content violates the Adobe Terms of Use, you may report this content by filling out this quick form.

To report a Copyright Violation, please follow Section 17 in the Terms of Use.