5 Weird Ways Identical Twins Aren't Actually Identical

Summary

This video explores the fascinating differences between identical twins, challenging the common perception that they are identical in every way. Despite sharing the same DNA, twins exhibit variations in fingerprints, body size, health, food preferences, and handedness. These differences arise from a combination of genetic factors and unique environmental influences, such as nutrition and health during childhood. The script highlights that while twins share many similarities, they are distinct individuals shaped by both their genetic makeup and their experiences, ultimately debunking the myth of total sameness among identical twins.

Takeaways

• 😀 Identical twins share many similarities, but they are not identical in every aspect.
• 🔍 Fingerprints of identical twins are similar but unique enough to be distinguished by software.
• 📏 Size differences between identical twins can occur, with the first-born typically being larger.
• 🍼 Growth factors such as placental weight and nutrient transfer affect the size of twins even in the womb.
• 🍽️ Differences in gut microbiomes lead to varying food preferences between twins.
• ✋ Identical twins can have different dominant hands, indicating both genetic and environmental influences.
• 🔬 Mutations in DNA after the zygote splits can lead to genetic differences between twins.
• 🧬 Identical twins are more genetically similar than fraternal twins but can still have distinct genetic anomalies.
• 💪 Illness during childhood can impact growth, leading to height differences in adulthood.
• 📸 Misidentifying themselves in photos is a common humorous struggle for identical twins.

Q & A

What is the common misconception about identical twins?

Many people assume that identical twins are identical in every way, including their DNA, appearance, and preferences.

How do identical twins' fingerprints compare to each other?

Identical twins have similar fingerprints, but they are not identical. Studies show that fingerprint identification software can distinguish between their prints.

What factors contribute to differences in size between identical twins?

Factors such as placenta weight, umbilical cord length, and amniotic sac conditions can affect nutrient transfer and growth, leading to differences in height and weight.

Can identical twins have different food preferences?

Yes, even though identical twins have similar gut microbiomes, environmental factors can lead to different food preferences and cravings.

Is handedness the same for all identical twins?

No, about 20% of identical twins have different dominant hands, suggesting that both genetic and environmental factors play a role in determining handedness.

What causes differences in DNA between identical twins?

Differences arise from mutations that occur during cell division after the zygote splits, resulting in each twin developing independently.

How do illnesses in childhood affect the growth of identical twins?

If one twin experiences more illnesses during childhood, they may end up shorter as adults compared to their healthier twin.

What is the role of the gut microbiome in dietary choices?

The gut microbiome influences cravings and food preferences by signaling to the brain what nutrients are needed, contributing to individual dietary habits.

What evidence suggests that twins can have different fingerprints despite similar DNA?

A study showed that identical twins’ fingerprints are more similar than those of non-twins, but there are still detectable differences that can be identified by software.

What impact does the environment have on identical twins?

Even when raised together, identical twins can develop differences due to unique environmental experiences, such as diet and lifestyle choices.