exploring dominant and recessive traits ... each person has about 70,000 pairs of genes. genes can...

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  • Exploring

    Dominant and

    Recessive Traits

  • 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

  • Common Misconception

     Recessive Traits are not rare traits.

     Dominant or recessive traits may be more common in a


     Example: Blonde hair is very common in parts of


     Example: The trait of having six fingers on one hand is a

    dominant trait!

  • DNA fun facts

     How long does it take one of your cells to completely copy its DNA?

     8 hours

     In the human DNA code is made up of base pairs: A-T and G-C on each side of the DNA strand. How many base pairs are in a DNA strand?

     3 billion

     If you were to recite the order of the ATCGs in your DNA starting tomorrow morning, at a rate of 100 nitrogen bases per minute, how long would it take you to recite one entire DNA strand if you didn’t stop to eat, drink, sleep or go to the bathroom, etc?

     57 years

  • DNA fun facts

     Autosomal cells have how many chromosomes?

     46

     Sperm and egg have how many chromosomes?

     23

     If you were to stretch out the DNA from your 46 chromosomes in just one cell and lay it end to end, how long would it be?

     Over 2 yards

     If the total DNA in one person were laid out in a straight line, how long would it be?

     30 times the distance to the sun

  • DNA fun facts

     How many cell nuclei could you fit across the period on

    your paper?

     1000

     How many threads of DNA could you fit across the same


     1 million

     If you wanted to store all the information from a strand

    of DNA on a computer, how much storage space would it

    take up?

     3 GB

  • DNA fun facts

     How genetically similar are you to any other

    random human on the planet? (percentage wise)

     99.9%

     How much genetic material do we as humans share

    with the bacteria e. coli? (percentage wise)

     7%

     How much genetic material do we as humans share

    with earthworms? (percentage wise)

     21%

  • DNA fun facts

     How much genetic material do we as humans share with the a zebra

    fish? (percentage wise)

     85%

     How much genetic material do we as humans share with a mouse?

    (percentage wise)

     90%

     How much genetic material do we as humans share with a chimpanzee?

    (percentage wise)

     98%

     What percent of our DNA codes for proteins?

     2%

     The dominant trait is always the better trait to have.

     False

  • Help!

     An alien from outer space teleports into the class. Upon

    seeing the class,

     the alien concludes that all humans look alike. It is your

    job as a class to assist the alien in differentiating

    humans from each other.

     Form a list with the people around you.

  • On a sheet of paper Yes Class Frequency No Class Frequency


















  • Earlobe

    http://www.sodahead.com/entertainment/eddie-murphy-movie-a-thousand-words-gets-zero-percent-rating-on-rotten-tomatoes-worst-movie-of-20/question-2513409/ http://www.sodahead.com/entertainment/eddie-murphy-movie-a-thousand-words-gets-zero-percent-rating-on-rotten-tomatoes-worst-movie-of-20/question-2513409/

  • Darwin’s Ear Points

  • Dimples

  • Tongue Rolling

  • Left handed

  • Freckles

  • Widows Peak

  • Curly Hair

  • Longer 2nd toe

  • Hair Color

    //upload.wikimedia.org/wikipedia/commons/f/fa/Black-Hair.jpg //upload.wikimedia.org/wikipedia/commons/f/fa/Black-Hair.jpg //upload.wikimedia.org/wikipedia/commons/3/33/A_child_of_chappargram.JPG //upload.wikimedia.org/wikipedia/commons/3/33/A_child_of_chappargram.JPG //upload.wikimedia.org/wikipedia/commons/7/7a/Woman_redhead_natural_portrait.jpg //upload.wikimedia.org/wikipedia/commons/7/7a/Woman_redhead_natural_portrait.jpg //upload.wikimedia.org/wikipedia/commons/d/d2/Akseli_Kokkonen.jpg //upload.wikimedia.org/wikipedia/commons/d/d2/Akseli_Kokkonen.jpg

  • Eyes

    http://en.wikipedia.org/wiki/File:Blueye.JPG http://en.wikipedia.org/wiki/File:Blueye.JPG http://en.wikipedia.org/wiki/File:S7307583.jpg http://en.wikipedia.org/wiki/File:S7307583.jpg

  • Thumb

  • Butt Chin/Cleft Chin

  • Skin Pigment

  • Vision

  • Tongue to Nose

  • Mid-digit hair

    Dominant Recessive

  • Index finger longer than ring finger

  • Bent little finger

  • Hand Clasping

  • Vulcanism

  • Questions to think about

     Which traits are most common in your class? Least common?

     Create a bar graph of the classroom responses.

  •  What evidence (data) suggests that humans are similar?



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