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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.

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!

The 18-year-olds from Gloucester, U.K. are two of the five children born to their Caucasian father and "half-Jamaican" mother, World Wide Features reports. While their other siblings have a blend of features from their parents, Lucy and Maria are opposites: Lucy has fair skin and red hair, while Maria has caramel skin and dark hair.

This case is based on Kate Chopin's short story "Desiree's Baby," a tragic tale of race and gender in antebellum Louisiana first published in 1893. Students read the story and then answer a series of questions about the genetics and evolution of skin color. The case was developed for a general biology course organized around the general theme of evolution. It could also be used in anthropology and biology courses for non-majors.