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Exploring dominant and recessive traits
 

Exploring dominant and recessive traits

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    Exploring dominant and recessive traits Exploring dominant and recessive traits Presentation Transcript

    • Exploring Dominant and Recessive Traits Biology CRHS Neistadt Courtesy of Miss Smith
    • 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?
    • 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
    • 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?
    • 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.
    • 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!
    • 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.
    • Earlobe
    • Dimples
    • Tongue Roller
    • Freckles
    • Eyelashes
    • Hair Line
    • Hair Type
    • Hair Color
    • Eyes
    • Lips
    • Thumb
    • Skin Pigment
    • Vision
    • Tongue to Nose
    • Fingers Do you have hair on your knuckles?
    • 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.
    • Pinkie
    • 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?
    • If time permits: Glencoe Biology Text chapter 10 Worksheet #49 & #17 from Pacemaker Text: Chapter 5