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In depth explanation of polygenic traits, including Rh.

Worksheet: codominance lethal genes multiple alleles polygenic traits

Discover more types of non-Mendelian inheritance such as incomplete dominance and codominance with the Amoeba Sisters! This video uses vocabulary that was previously defined in the Amoeba Sisters Monohybrid Crosses video.

SciShow explains the genetics -- and physics -- behind why blue eyes are blue, and what the future may be for the trait. Spoiler alert: Blue eyes aren't really blue! SciShow explains!

When babies are born, their eyes and hair are one color, but change within the first few years of their life! Why do hair and eye colors change? Trace explains the process of inheriting certain traits from your parents, and discusses why the colors change!