We are independent & ad-supported. We may earn a commission for purchases made through our links.

Advertiser Disclosure

Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.

How We Make Money

We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently from our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.

What is the Difference Between Fraternal and Identical Twins?

Tricia Christensen
By
Updated Mar 06, 2024
Our promise to you
PublicPeople is dedicated to creating trustworthy, high-quality content that always prioritizes transparency, integrity, and inclusivity above all else. Our ensure that our content creation and review process includes rigorous fact-checking, evidence-based, and continual updates to ensure accuracy and reliability.

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

Editorial Standards

At PublicPeople, we are committed to creating content that you can trust. Our editorial process is designed to ensure that every piece of content we publish is accurate, reliable, and informative.

Our team of experienced writers and editors follows a strict set of guidelines to ensure the highest quality content. We conduct thorough research, fact-check all information, and rely on credible sources to back up our claims. Our content is reviewed by subject matter experts to ensure accuracy and clarity.

We believe in transparency and maintain editorial independence from our advertisers. Our team does not receive direct compensation from advertisers, allowing us to create unbiased content that prioritizes your interests.

Fraternal and identical twins have many differences. Identical twins are often described as those children resulting from a pregnancy that are identical to each other. Actually, more than resemblance is involved, and not all identical twins look “completely” alike, though they do share many of the same physical characteristics. As they age, they will have differences based on lifestyle choices, experiences, and a variety of other factors. Fraternal twins, though sharing a womb, have fewer commonalities, and both types of twins are most identified by how they begin life.

Most commonly, the way twins first begin life can be referred to as dizygotic and monozygotic. Dizygotic, or fraternal twins, result when a woman has two ova or eggs fertilized by two separate sperm. This can mean that fraternal twins are of different or the same gender. Though they are siblings, they do not share near identical genetic material.

Within each sperm or ova, there is variance in what gets inherited and expressed, and these children are as alike as siblings, which can be very alike or unlike. They also may share a special relationship because they shared a womb. Though these twins are the same age, however, they are usually easily distinguished from each other, just as it would be simple to tell apart siblings of different ages.

The conception of monozygotic (identical) twins is very different. Instead of two separate ova being fertilized by two sperm, these twins begin as one ova and one sperm. During the early process where the fertilized egg begins to produce more cells, it doubles itself and creates two embryos or two babies, instead of one. Since both babies are produced from the same fertilized egg, they share almost all the same chromosomes and DNA structure, and will bear remarkable resemblance to each other. They are truly more related than fraternal twins because of their beginning.

There are other differences between fraternal and identical twins. Identical twins are much more rare, and only 8% of all twins are identical. Moreover, fraternal twinning can be hereditary, but identical twinning is seldom hereditary and occurs with the same general likelihood in all populations.

There is much greater difference in the number of fraternal twins born in various populations, suggesting a degree of inheritance. Fraternal twinning is not always the product of genetics. Multiple births are less common in women who are vegetarians, and much more likely when women undergo fertility treatments to conceive.

Not matter how twins begin life, they will all have differences. Choices in life can make significant impact on which DNA gets expressed. This means identical twins will evolve along separate paths, though many of them stay very close. Most child development experts believe that both identical and fraternal twins should be encouraged to celebrate their individuality, since considering them as the same does not give each twin the opportunity to find his or her own gifts and strengths.

PublicPeople is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Tricia Christensen
By Tricia Christensen , Writer
With a Literature degree from Sonoma State University and years of experience as a PublicPeople contributor, Tricia Christensen is based in Northern California and brings a wealth of knowledge and passion to her writing. Her wide-ranging interests include reading, writing, medicine, art, film, history, politics, ethics, and religion, all of which she incorporates into her informative articles. Tricia is currently working on her first novel.

Discussion Comments

By anon955864 — On Jun 10, 2014

Identical twins do not always look identical. In about 99.9 percent of cases they do. Most people do not know, however, that there are cases, a few cases, only twelve recorded cases of Male/Female identical twins.

This happens when a male, from a male/male set, 'mutates' if you would, during development into a female.

Out of these twelve cases, only two have been reported that the female did not develop Turner's Syndrome.

I know this simply because my sister and I are one of the pairs out of twelve.

By burcidi — On Feb 19, 2013

I know that identical twins will have different personalities, but I still think that they are more similar to one another in terms of personality than fraternal twins.

I have both identical twins and fraternal twins in my friend group. The fraternal twins are nothing like each other. They have totally opposite personalities and like different things.

The identical twin boys, on the other hand, are fairly similar. They enjoy many of the same hobbies, have lots of mutual friends and spend time together.

By fBoyle — On Feb 18, 2013

@ankara-- A good way to remember the difference between identical and fraternal twins is to keep in mind that identical twins come from one egg and one sperm and fraternal twins come from two eggs and two sperm.

Identical twins will always be the same gender, because the second embryo is simply a copy of the first. So everything will be exactly the same.

With fraternal twins, the embryos are fertilized by separate eggs and separate sperm. So if the genetic material determining gender are different, they will be of different sex.

Fraternal twins are simply two unique babies growing together at the same time in the womb. Identical twins is the same embryo splitting into two, resulting in two babies of the same DNA makeup and characteristics.

By bluedolphin — On Feb 18, 2013

I know that fraternal twins can be of different genders. But identical twins are always of the same gender right? Why is this?

Tricia Christensen

Tricia Christensen

Writer

With a Literature degree from Sonoma State University and years of experience as a PublicPeople contributor, Tricia...
Read more
PublicPeople, in your inbox

Our latest articles, guides, and more, delivered daily.

PublicPeople, in your inbox

Our latest articles, guides, and more, delivered daily.