Exploring dominant and recessive traits

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  • 1. Exploring Dominant and Recessive Traits Biology CRHS Neistadt Courtesy of Miss Smith
  • 2. Questions to Think About Let’s list together any genetic traits you can think of on the whiteboard. • For example: eye color, hair color Where do traits come from? What do you think Dominant or Recessive Traits are?
  • 3. Where do traits come from? Your parents pass them down through genetic traits. You receive half of your genes from each parent Each person has about 70,000 pairs of genes. Genes can be dominant or recessive
  • 4. Dominant Traits vs. Recessive Traits Dominant trait-Strongest trait Dominant trait-Masks or covers up the weaker trait • Which hair color do you think is dominant? • Which eye color do you think is dominant? • Which hair color do you think is recessive?
  • 5. Formal Definition Dominant Trait: the trait observed n the first generation when parents that have different traits are bred. Recessive Trait: a trait that reappears in the second generation after disappearing in the first generation when parents with different traits are bred.
  • 6. Common Misconception Recessive Traits are not rare traits. Dominant or recessive traits may be more common in a population. Example: Blonde hair is very common in parts of Scandinavia. Example: The trait of having six fingers on one hand is a dominant trait!
  • 7. Partner Time! Get with a partner. Complete the worksheet together having your partner help you identify if you have the traits listed. Put a check mark beside the trait you have. We will share our results together at the end! When you have completed the worksheet, glue this page into your notebook. It should go onto page 13.
  • 8. Earlobe
  • 9. Dimples
  • 10. Tongue Roller
  • 11. Freckles
  • 12. Eyelashes
  • 13. Hair Line
  • 14. Hair Type
  • 15. Hair Color
  • 16. Eyes
  • 17. Lips
  • 18. Thumb
  • 19. Skin Pigment
  • 20. Vision
  • 21. Tongue to Nose
  • 22. Fingers Do you have hair on your knuckles?
  • 23. Interlaced Fingers Without thinking about it, interlace your fingers like the picture shows. If your left thumb is over your right, then you have the dominant trait.
  • 24. Pinkie
  • 25. Questions to think about Were traits that are dominant, actually dominant among our classmates? Is it possible to have traits that are not visible in your parents?
  • 26. If time permits: Glencoe Biology Text chapter 10 Worksheet #49 & #17 from Pacemaker Text: Chapter 5