Which type of twins are genetically different and arise from two separate ova?

Fraternal twins, also known as dizygotic twins, originate from the fertilization of two separate ova by two different sperm cells. This results in two genetically distinct embryos, each having its own unique genetic makeup. Since fraternal twins develop from two separate eggs and sperm fertilization events, they can be of the same sex or different sexes and may have varying physical characteristics.

Identical twins, in contrast, originate from a single fertilized egg that splits into two embryos, making them genetically identical. Conjoined twins arise when a single fertilized egg partially splits but does not fully separate, leading to twins that are physically connected. Hybrid twins, although not a commonly recognized term in human biology, usually refer to instances involving different species, which doesn't apply to the context of human twin types.

Thus, the distinguishing feature of fraternal twins being genetically different is key to understanding why this choice is the correct answer.