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If one egg is fertilized and as it begins to grow it divides into two separate zygotes (fetuses) then they can develop into identical twins. If two separate eggs are both fertilited at the same time they will develop into fraternal twins

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โˆ™ 10y ago
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Q: How does identical and fraternal twins happen?
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Related questions

What kinds of twins are there?

Identical and Fraternal There are identical and fraternal. Fraternal twins happen when 2 different embryos start growing at the same time, so you get a brother and a sister or 2 sisters or 2 brothers that are the same age. Identical twins happen when 1 embryo splits into 2 embryos when it is only a few cells big, so both babies have the same genes.


What percentage of twins are fraternal?

There is no precise percentage of fraternal or identical twins but it is estimated that 2/3 of all twins are fraternal where as 1/3 of twins are identical.


Why are identical twins identical and fraternal twins are not?

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.


Why are identical twins and fraternal twins not the exact same?

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.


Which is more common fraternal twins or identical twins?

Fraternal twins are more popular.


Why are Identical and fraternal twins similar?

They are twins!


What is the difference fraternal and identical twins?

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


Why are the twins identical?

Twins are not necessarily identical. They can be fraternal as well. Identical twins result when one fertilized egg splits in two. Fraternal twins result from two fertilized eggs.


How do you know if two twins are identical or just fraternal twins that look a lot alike?

(Person that asked the question)-Once twins are born, and old enough to determine whether they are identical or fraternal, how do you know if they are identical, or just fraternal twins that look identical? I was just curious.


What is identical and what is fraternal?

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


Who are clones fraternal twins or identical twins?

Identical twins, due to the fact that the one fertilized egg splits, have identical DNA. Fraternal twins, since they are from separate eggs, have different DNA.


Are mia hamms twins fraternal or identical?

identical