That would be a very unusual situation. Note that due to the normal process of genetic reshuffling that is involved in human reproduction, the children of the two couples would not be genetically identical even though their parents are.
no they dont
Any set of twins that are not identical (whether it's boys or girls or a combination of the two) are fraternal twins.
No they are both boys, identical twins.
because the cheeky girls are identical twins
Yes, it is possible. It would be more common if the twins are fraternal that only one twin would be affected by the disease because it is a recessive trait, meaning both parents must be a carrier for the offspring to be affected. If the twins are identical and the tay-sachs gene is present, then boths twins will be infected because identical twins have identical DNA
Acctually, they're children would not look like twins. But all of their children would look like brothers and sisters.
Identical twins. Although horses sometimes have twins I'm not sure if they have identical twins.
If they were not then they would not be called identical twins!
No. DNA is unique to every person in the world. Even identical twins have DNA markers that are different from each other. Therefore, when you have any offspring, sexually produced or lab-grown, that offspring is going to have a unique combination of DNA from both parents that will be unique only to that offspring.
By convention, a clone is an engineered offspring derived from the genetic material of a single adult. Identical twins are genetic copies of each other, but they were formed by the splitting of a fertilized zygote rather than by extracting the genetic material of a single adult.
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.