Extracting Fruit DNA
Location: Outside U.S.
Date: Winter 2012-2913
Does the amount of DNA differ when extracted from different fruits?
Thanks for the question. You can expect some difference in the amount of DNA extracted from various fruits due to the different chemicals present in each of the fruits. I am unable to predict which fruit gives more DNA as there are several factors involved.
Just remember that the seed part of the fruit is where the DNA is. The DNA is not in the fleshy part--the part often eaten.
I would recommend consulting a teacher before trying to extract any DNA as the chemicals used in the process can be harmful.
I hope this helps. Please let me know if you have more questions.
This question is a good one, but it is a little complex to explain in a way that a middle school student will be able to understand. Botanists have learned that by increasing the number of chromosomes, fruits may become larger, and in the case of strawberries, sweeter as well. This chromosome duplication can be done chemically. These plants are called tetraploids if you want to pursue this further by searching.
Many plants also duplicate more DNA than needed to help in the production of fruit. Bananas are an example. The study this further, look up seed and fruit development. This process is involved so be advised.
I have not given you a great deal of information, but the search topics will provide more details than I think you are able to understand. At least you will have an idea of answering your question.
Yes, it does. I suspect it may depend on the mass of the fruit tissue which contains the DNA with respect to (1) water content (2) carbohydrate content. The internet has many experiments listed that show how to extract genomic DNA fruit. Why not try extracting genomic DNA from corn. That might be interesting.
Remember DNA is not found in water or carbohydrate of fruit.
Stephen R. Dunn
Ass't Professor of Medicine (ret.)
Kimmel Cancer Center &
Division of Nephrology
Thomas Jefferson University
It should. You and I are diploid animals because we have 2 of every chromosome type in our nuclei. Strawberries, for example, are octaploid-they have 8 of every chromosome. So if the amount of cells is the same, you should get more DNA from strawberries than from your cells. But, that assumes you have the same number of cells in your sample.
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Update: November 2011