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Fraternal twins are not necessarily conceived at the exact same moment, but they are usually conceived within a short time frame of each other. They develop from two separate eggs fertilized by two separate sperm cells during the same menstrual cycle. This means that while they are conceived around the same time, the exact moment of fertilization for each egg can vary by a few hours or even days.
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What are twins born at the same time but do not look alike called?
Fraternal twins.
Is fraternal twins an example of cloning?
No. They are the same as any brother or sister but they are born at the same time.
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.
Do twins have to have the same color hair?
Not all the time if they do and look the sane then they're idendentical twins, if they look totally opposite they they're fraternal twins
How does identical and fraternal twins happen?
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
What is the difference between dizygotic twins and monozygotic twins?
Dizygotic twins develop from two separate ova fertilized by different sperm at roughly the same time, they are also called fraternal twins. Monozygotic twins develop from one zygote that splits apart producing genetically identical zygotes; also called identical twins.
Are fraternal twins born at different times?
Yes, while twins both develop at the same time in the same womb, one can only give birth (naturally or by cesarean section), in sequence. "Fraternal" means they are brothers, both embryos were male.
Which type of twins develop from two fertilized eggs?
Twins from different eggs are fraternal twins. They are siblings with the same birthdate. They are twins, but not identical, and can even be girl and boy. It is the same process taking place as a single child that a woman becomes pregnant with, but the process happens with two children at the same time. The woman releases two eggs that month instead of one, and they both are fertilized. That is how this type of twin is produced.
Why might genetically identical twins have different phenotype?
This is because fraternal twins are simply two full siblings that happen to share the womb at the same time. There is no more reason for fraternal twins to be the same than there is for any brother/sister, brother/brother or sister/sister sibling set to be the same.
If twins aren't identical what are they called?
Twins who are of the opposite sex or do not look alike are fraternal twins ~ not identical. This means that at the time of their conception ~ two eggs were fertilised. In the case od identical twins, one egg is fertilised and split in half.
Who is elder in fraternal twins?
They are rarely, if ever, delivered at the same time. So the one who is delivered first is the elder.
Why do fraternal twins have their own placenta?
Identical twins may or may not share the same placenta . Identical twins develop when a fertilized egg splits. Depending on when the split occurs will determine if the twins share a placenta, with either one or two chorions and amnions, or if they each develop their own placentas.
