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Identical twins are formed from a single egg that splits into two. Fraternal twins are formed from two separate eggs that are both separately fertilized. So identical twins have identical DNA, and fraternal twins do not.

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โˆ™ 2013-08-24 18:16:11
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Q: Why are identical twins and fraternal twins not the exact same?
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Related questions

Are fraternal twins identical?

No that's why theyre called fraternal twins. Identical twins are identical (share the exact same genes) while fraternal twins are as similar to each other as normal siblings are.

Do fraternal or identical twins have the same DNA?

Identical twins do not have the same DNA; it is quite similar, but not exact. fraternal twins are no more similar than sibling likenesses.

Are twins that are in the same sac identical or fraternal?


Is the DNA in twins the same?

In identical twins, the DNA is identical, which is what makes them identical. In Fraternal twins it is not.

What is the difference between fraternal and identical twins?

identical twins are born at the same time AND look the same l. Fraternal twins are born at the same time but do not look identical..

What is the difference identical and fraternal twins?

Identical twins come from the same fertilized egg; fraternal twins come from 2 fertilized eggs.

What are fraternal twins?

Fraternal twins are two siblings that have the same birth day, but do not look identical.

Do fraternal twins come from the same egg?

No, identical twins do, but fraternal twins come from 2 separate eggs.

Why is there fraternal and identical twins?

Identical come from the same fertilized egg

What are indentical twins?

Identical twins, or in-fraternal twins, are the offspring that look exactly alike and are of the same gender, sharing the same exact genetic information. In-fraternal twins occur when a fertilized ovum (egg) has divided and each went on to become an embryo containing exact same genetic information.

Why Can fraternal twins be different gender but identical twins are always the same gender?

fraternal twins have two different chromosomes

Why do identical twins occur?

Identical twins, or In-fraternal twins, occur when a fertilized ovum (egg) has divided into two and each go on to become an embryo having exact same genetic information.

Do Identical twins think more alike than Fraternal?

Yes. Fraternal twins don't look alike at all. Identical, meaning to look the same, are well, identical.

What is twins developing from the same egg cell called?

identical twins, as opposed to fraternal.

Was Shakespeare's twins identical?

No. All identical twins are the same sex. Judith and Hamnet were opposite sexes, and so were fraternal twins.

Can fraternal twins be of the same sex?

The answer is yes. I have quadruplets who are all fraternal and are all boys. Fraternal (non identical) multiples can be of any sex. Identical multiples are of the same sex.

Can faternal twins be the same gender?

They can be. While identical twins always have to be the same gender, fraternal twins usually are not. However this is not always the case. Identical twins occur because they inhabit the same egg. Fraternal twins because two eggs were fertilized at the same time. So fraternal twins could be the same gender, but usually they are of the opposite gender.

What are twins called when they both do not look the same?

Fraternal (instead of identical)

How can you tell the difference between fraternal and identical twins?

Identical twins would look the same, fraternal twins could be of different sexes. In the womb, you can easily tell the difference between fraternal and identical twins because if the twins are identical, they will share the same sac. Fraternal twins will have different sacs. You can see this in the ultrasound. After birth, it is often very difficult to tell the difference between the two types of twins because babies often look alike particularly when they are siblings even if they aren't identical genetically. If the twins are fraternal it usually gets easier to tell the difference as they get because they tend to look quite different as they age. Fraternal twins are only siblings while identical twins are genetically identical.

What is it called when twins are different genders?

Fraternal twins. Fraternal twins can be the same gender too, but since they are produced from two eggs from the mother, they are not identical.

Can non-identical twins be the same sex?

Yes, the sex of the fraternal twins has nothing to do with the fact that they are twins.

Are fraternal twins the same gender?

Fraternal twins can be either boys or girls, or a combination of one girl, one boy. They are different from identical twins, who share the same DNA and must be the same gender. Fraternal twins have their own unique DNA and while they may look similar, they are not identical in appearance.

Why can fraternal twins be different genders but identical are the same gender?

Because - fraternal twins are formed from two separate eggs, which have been fertilized simultaneously. Identical twins are formed from a single egg.

Why can twins look the same but aren't the same height length or weight?

Twins can either be identical or fraternal.Identical twins are obviously identical, and fraternal twins aren't. Fraternal twins are still born at the same time, hence the name "twins", but they do not look exactly alike. It is perfectly plausible for fraternal twins to look the same, but not be identical. Many fraternal twins appear to be identical, but are really not.Also, even identical twins don't stay the same height/weight their whole lives. Their height and weight would depend on their diet and exercise. If one was an active, healthy, person, and the other was a couch potato, they both wouldn't always be the same weight just because they are twins.

How can you tell the difference between your DNA and your twins DNA?

There are two types of twins- fraternal and identical. Fraternal twins are only siblings born at the same time. Identical twins started as 1 egg that split in two after being fertilized. The DNA of identical twins is, well.... identical. At one point, they WERE the same person.