Are all twins identical?
No. Identical twins are identical. Fraternal twins are not.
Identical Twins Sometimes, after fertilisation, the fertilised ovum splits and divides into two balls of cells. Twins formed in this way are identical. They develop from the same ovum. Non-identical Twins Sometimes a woman's ovaries release two or more ova at the same time. If they all become fertilised, they all develop into babies. Twins formed in this way are non-identical. They develop from different ova fertilised by different sperms.
If atleast one person in your family has identical twins what are your chances of having identical twins and does someone in your family have to have had twins for you to be able to have twins?
The chance of having non-identical twins can run through genetics or be affected by the age of the mother. So the more people in your family tree that have twins, the more likely you are to have twins. However, twins can occur by chance, to someone who's family tree has no cases of twins, or from IVF. You do not have to have twins in your family line to give birth to twins. The chance…
Monozygotic (Identical or Maternal) twins are identical because they came from the same egg and were split after conception but before fetal development. Identical twins have nearly identical DNA, however, environmental factors may switch genes on and off, differences are more pronounced as the twins age. Dizygotic (Fraternal) twins are not identical. They are as different as any other siblings.
This is not a probability questions but a biological question and, of course, not all sets of twins are identical. If the twins are identical, this means that a single fertilized egg split in two before it started developing into a fetus. As a result, both twins have identical genetic information. If they are not identical, then this means that two eggs were in the uterus at the same time and that they were both…
Identical twins (monozygotic) occur when a single egg, fertilized by a single sperm, splits into two identical halves. Two separate babies with identical DNA are formed. Identical twins are always the same sex and blood type. http://www.twin-pregnancy-and-beyond.com/identical-twins-or-fraternal-twins.html