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Genetic Inheritance

This article explores various human genetic traits, distinguishing between dominant and recessive inheritance patterns. Learn about traits like attached and free ear lobes, widow's peak, finger lengths, and cleft chin. We discuss dominant traits such as dimples and tongue rolling, alongside recessive traits like bent little fingers and hairlessness. Discover the fascinating science behind PTC tasting, achondroplasia, and the significance of palm muscle structure. Gain insights into how these traits manifest and their genetic implications.

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Genetic Inheritance

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  1. Genetic Inheritance

  2. Free ear lobe: Dominant Attached ear lobe: Recessive

  3. Widow’s Peak: Dominant Trait

  4. Recessive: Index finger same or larger than ring finger Dominant: Index finger shorter than ring finger

  5. Bent Thumb (hitchhiker’s thumb): Recessive trait

  6. Bent Little finger – bends towards the ring finger Dominant trait

  7. Mid-digit hair: Dominant trait

  8. Hand Clasp: Left thumb on top – Dominant

  9. Cleft chin (chin fissure): Dominant trait

  10. Freckles: Dominant Trait

  11. Dimples: Dominant Trait

  12. Tongue Rolling: Dominant Trait

  13. Long Palmar Muscle Those who are dominant have two tendons. Those who are recessive have three (or more) tendons. To determine: Palm up Clench your fist Flex your hand away from face Look and feel for three tendons. A middle tendon indicates the presence of the recessive long palmar muscle.

  14. PTC tasting (Tasting PTC, T, is dominant over the inability to taste it, t.) Chew a piece of PTC paper for a few seconds. If you can detect the bitter taste of PTC, you are T_

  15. Achondroplasia (form of dwarfism) - dominant

  16. Ptosis (one or more eyelids droop) : Dominant Trait

  17. Woolly Hair: Dominant

  18. Normal Fruit Fly Vestigial Wings (reduced and can’t fly): Recessive Trait

  19. Hairless trait: Recessive

  20. Hairy ears – Mystery trait! Use to be thought that it was sex-linked on Y chromosome

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