Yes! Identical twins came from the same sperm and egg, so they have the same chromosomes and genes. So identical twins with identical DNA may have different genes turned on, causing them to look and act differently, and even to develop different diseases such as cancer.

Why dont my identical twins look alike?

But, actually, twins who start out with identical DNA always have slightly different DNA by the time theyre born. DNA is large and very little of it has to do with, for example, skin and eye color. By chance, the DNA differences for these girls happened to be in the smallish part of their genome that deals with looks.

Can identical twins have different facial features?

This study also shows us that even identical twins can vary quite a lot on facial features, but because of the key areas being genetically controlled, we perceive them as being identical, added Professor Tim Spector, Director of the TwinsUK study at Kings College London.

Why do identical twins still look different?

If by chance one identical twin silences the X chromosome that came from Dads sperm and the other twin silences the X chromosome that came from Mums egg, then they have different genes working in their systems, which can result in noticeable differences.

Can twins look completely different?

Fraternal twins dont share identical DNA and are no more genetically similar than any other siblings. They can be opposite sexes and can look completely different from each other.

Are identical twins 100% the same?

It is true that identical twins share their DNA code with each other. This is because identical twins were formed from the exact same sperm and egg from their father and mother. (In contrast, fraternal twins are formed from two different sperm and two different eggs.)

Are non identical twins rare?

Fraternal – or dizygotic – twins form from two eggs that have been fertilized by two of the fathers sperm, producing two genetically unique siblings. They share 50% of their DNA. But “semi-identical” twins are so rare, experts say they have only identified two cases – ever.

Can one identical twin have ADHD?

Identical twins Unfortunately, they also share the risk of having ADHD. According to an Australian study , twins are more likely to have ADHD than singletons. Additionally, a child who has an identical twin with ADHD has a high chance of also developing the disorder.

How rare are non identical twins?

These twins are no more genetically similar than siblings born years apart. The rates of non-identical twins differ between groups: its about eight in 1,000 in caucasian populations, 16 in 1,000 in African populations, and four in 1,000 in people of Asian decent.

Are boy or girl identical twins more common?

Among non-twin births, males are slightly (about five percent) more common than females. In the US, 105 non-twin males are born for each 100 non-twin females.

Does the mother or father determine twins?

For a given pregnancy, the odds of conceiving fraternal twins are only determined by the mothers genetics, not the fathers. Fraternal twins happen when two eggs are simultaneously fertilised instead of just one.