Question

which of the following has been proven true by researchers of identical twins?
o identical twins have different personality genes.
o identical twins are never the same gender.
o identical twins share the same dna and blood type.
o identical twins are no more alike than fraternal twins.

Explanation:

Identical twins are formed from a single fertilized egg that splits. As a result, they have identical DNA. Blood type is determined by genes, and since their DNA is the same, they share the same blood type. Option A is incorrect as identical twins have the same genes (including those related to personality - though environment also plays a role). Option B is wrong because identical twins are always the same gender. Option D is false as identical twins are more alike genetically than fraternal twins (fraternal twins come from two separate eggs fertilized by two separate sperm).

Answer:

C. Identical twins share the same DNA and blood type.