Biology Experiment for kids – Extract and observe the DNA of a pear!

dna experiments for kids

In this amazing biology  experiment for kids, we will see how to extract DNA from a pear. What is DNA? DNA is our genetic code, and includes all the information about our bodies, for example our size, the shape of our face, etc. For this experiment, I have chosen to extract DNA from a pear. But you can also use other fruits, like an apple or a banana. You can even collect some of your saliva with a cotton swab and extract DNA.

Biology  experiment for kids Equipment:

  • A pear
  • A plate and a knife
  • A fork
  • Salt
  • Vinegar
  • A bottle
  • A funnel
  • Cotton
  • Two coffee filters
  • A test tube or a narrow glass
  • Alcohol for burning

Biology  experiment for kids Instructions:

  1. Start by cutting up the pear and then mash it with a fork, adding a little salt and vinegar. Mix well to make a puree.
  2. Place the coffee filter in the funnel with cotton inside and pour in the fruit puree to filter it. Squeeze the filter to extract as much juice as possible.
  3. Using the funnel, pour about 2 cm of the juice into a test tube or a narrow glass.

Add 4 cm of alcohol (twice the volume) to precipitate the DNA. Slowly turn the tube to collect the whitish strands of DNA.

Biology  experiment for kids Explanation:

This experiment allows you to break down all of the cell membranes of the pear. The fork mechanically breaks down the pear, while the salt and vinegar break up the external membranes, as well as the membranes of the nuclei containing the strands of DNA. The DNA dissolves in this mix, so we can remove larger debris by filtering the puree.

DNA dissolves in water. Alcohol causes it to precipitate, as it does not bind with alcohol in the same way as it does with water. DNA floats (or sometimes floats), because it is less dense than alcohol.

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