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Understanding Human Traits: A Guide to Dominant and Recessive Genetics

This guide explores key human traits governed by genetic inheritance, including tongue rolling, earlobe attachment, ear bumps, hairline shapes, thumb positioning, and facial features like dimples and freckles. Each trait is categorized as dominant or recessive, providing a clear understanding of how these genetic traits manifest and their implications in family pedigrees. Learn how to analyze common physical characteristics and better appreciate the genetic diversity in our traits.

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Understanding Human Traits: A Guide to Dominant and Recessive Genetics

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  1. Simple Human Pedigree Analysis

  2. Tongue Rolling • Dominant = can roll tongue • Recessive = Flat tongue

  3. Earlobes • Dominant = detached earlobes • Recessive = attached earlobes

  4. Earbump • Often called Darwin’s Ear Bump • Dominant - Having a small bump on the ear • Recessive - Not having the bump

  5. Widow’s Peak • Dominant = widow’s peak • Recessive = straight hairline

  6. Hitchhiker’s Thumb Recessive Dominant

  7. Dimples • Dominant = have dimples • Recessive = no dimples

  8. Cleft Chin • Dominant = have dimples • Recessive = no dimples

  9. Freckles • Dominant = have freckles • Recessive = no freckles

  10. Interlocking fingers • Dominant = Left thumb on top • Recessive = Right thumb on top

  11. Pedigree Conventions

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