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Genetics Science Fair Project

Identical Twins: A Science Project

Identical Twins: A Science Project | Science Fair Projects | STEM Projects
Are identical twins really identical? In this science project, you'll compare twins and siblings to find out. You'll measure their height, weight, and eye color, and compare their hair and facial features. You'll even compare their fingerprints to see if they're really identical!


The hypothesis is that twins have similar physical appearances but different fingerprints.

Method & Materials

You will examine the twins as pairs and compare their hair, facial features, height, weight, eye color, and fingerprints.
You will need a pair of identical male twins, a pair of identical female twins, a pair of fraternal male-female twins, two siblings, an ink pad, a piece of paper, a roll of tissue paper, a measuring tape, and a weighing scale.


The results showed that the identical twins had the same type of hair, eye color, and facial appearance. Their height and weight were also similar, but their fingerprints were not the same. The fraternal twins displayed some similarities, but they were not as identical/similar as the rest of the twin pairs. For the siblings, the hair was similar but everything else was not identical.

Why do this project?

This science project is interesting because it shows that even though twins have the same DNA and look very similar, there are still some differences between them.

Also Consider

To get more reliable results, repeat the experiment with more participants in each group and tabulate the average results. Try repeating the experiment with older participants.

Full project details

You can find additional information and details for this science fair project here. Have fun exploring!

Related videos

Hey there! Here are some awesome videos about this science project that we think you'll really like. They're not only super fun, but they'll also help you learn more about the science behind the project. So sit back, relax, and get ready to have some fun!!
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