Yes, they have 2 sets of twins, one is fraternal and one is identical. The identical set is John David and Jana.
Identical twins. Although horses sometimes have twins I'm not sure if they have identical twins.
Two, Jana and John-David Jeremiah and Jedidiah
If they were not then they would not be called identical twins!
Approximately 30 of twins are identical, also known as monozygotic twins.
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.
Twins are identical because they come from the same egg.
Identical twins are formed when one fertilized eggs splits. Non-identical twins are formed when two separate eggs are fertilized.
The same as when you had the first set of identical twins.
Non identical twins.
No.
the chances of having identical twins are about 1 in 300.
No, identical twins do not always share a placenta. In some cases, identical twins may have separate placentas.