Lifesize Punnett Square Activity

Version 1

    I created this activity in animal science when talking about genetic traits in livestock.  Before this activity students knew about inheritance and a small Punnett Square.  I was looking for an fun way to teach them how to use a large Punnett Square to show the inheritance of two traits.  Attached are pictures that show the set up and large Punnett Square.  Check those out first to get an idea of what the instructions mean!

     

    Pre-Work: It is important to explain the following concepts before using this activity.

    -Meiosis and Mitosis

    -Why there is a chromatid from each parent that come together to make a chromosome

    -Genes are located on a chromatid

    -How many pairs of chromosomes in different species (30 pairs in cattle, but we are only showing 1 pair in the box)

     

    Materials:

    Red Spice Drops

    Orange Spice Drops

     

    Red Gummy Bears

    Yellow Gummy Bears

     

    Red Toothpicks

    Blue Toothpicks

     

    Masking Tape

     

    Set Up:

    Tape off a large Punnett Square on a table.  It needs to be 4 squares by 4 squares (a total of 16).  The spice drops represent one trait, the gummy bears represent another trait.  The red toothpicks are female chromatids and the blue toothpicks are male chromatids.

     

    Red Spice Drops= T horns

    Orange Spice Drops= t polled

     

    Red Gummy bear= B black

    Yellow Gummy Bear= b red

     

    Have the students write the parents genotype on top of the square with a marker.

     

    Scenario for students:

    The cow has the genotype TtBb and the phenotype of horns and a black body.  The bull has the genotype TtBb and the phenotype of horns and a black body.  Complete the large table illustrating the inheritance of these two traits.

    Write out the combinations that are possible from crossing these two animals.