Identical Twins vs. Fraternal Twins

  • By: Maya
  • Date: April 1, 2022
  • Time to read: 3 min.

Identical twins are the result of one fertilized egg splitting in two. Fraternal twins occur when two eggs are fertilized at the same time. Fraternal twins share 100% of their genetic makeup, while identical twins share only 50%. Fraternal twins are more likely to have different birth weights and head circumferences. They also may be more likely to have congenital abnormalities. However, fraternal twins do not typically share memories or experiences from early in life.

Identical Twins:

Identical twins are created when a fertilized egg splits into two separate embryos. These twins share 100% of their DNA, making them very similar to one another. Fraternal twins, on the other hand, only share about 50% of their DNA. This means that they look and act very differently from one another. Identical twins often have the same interests and personality traits, which can make them very close as siblings. Fraternal twins often have more differences in their personalities than similarities.

Fraternal Twins:

Fraternal twins are created when two eggs are fertilized by two different sperm cells. These twins share only 50% of their DNA. Fraternal twins can have different hair colors, eye colors, and even personalities. Identical twins, on the other hand, have the same DNA. This means that they are 100% identical.

Difference in Development:

Twin studies have long been used to study the development of human beings. Identical twins share all of the same genes, while fraternal twins do not. This means that identical twins are more similar than fraternal twins and can be used to better understand how development works.

There are a few key differences between identical and fraternal twins when it comes to developmental milestones. Fraternal twins tend to complete puberty at around the same time, but they also go through different stages of maturity. Identical twins often have more similar personalities and are more likely to share common interests and talents. However, there are also significant differences between them, including in IQ scores and lifetime psychiatric diagnoses.

Overall, twin studies provide a wealth of information about how development works and how genetic and environmental factors interact. They can help us better understand individual differences as well as patterns across populations.

Differences in Appearance:

Identical twins are genetically identical people who were born at the same time and place. Fraternal twins are two people who are not genetically identical, but who were both born to the same mother. There are many differences between identical twins and fraternal twins. Here are a few: Identical twins share 100% of their DNA, while fraternal twins share only 50%. This means that if one of the twins has a mutation in their DNA, the other twin will also have the mutation. Fraternal twins also have slightly different hormones in their bodies due to their difference in prenatal exposure. These differences can lead to some fraternal twins feeling very close and others feeling very different from each other.

Differences in Health:

Identical twins are the perfect example of two people who have identical DNA. Fraternal twins, on the other hand, are born when one egg is fertilized by two different sperm. This means that fraternal twins have a fraction of their genes from each parent. Health differences between identical and fraternal twins have been studied for years, but there is still much to learn about these differences. Here are some key findings: 

In terms of overall health, fraternal twins fare just as well as identical twins. There is no evidence that suggests they are at greater risk for certain diseases or conditions. In fact, studies suggest that fraternal twin pairs may be more likely to share common health problems than identical twin pairs. One explanation for this could be that sharing a background environment makes it more likely for twin pairs to get along and share information.


In conclusion, identical twins are more alike than fraternal twins. This is due to the fact that they share the same DNA. However, fraternal twins are still more alike than two siblings who are not twins. This is because they share a similar environment growing up. Twins offer a unique opportunity for researchers to study genetic and environmental influences on development.

Leave a Reply

Your email address will not be published.

dad twins

Previous Post

How To Prepare For Twins as a Father

Next Post

Identical Twins Marry Identical Twins

Marriage