Final answer:
Dizygotic twins like Jewel and Bjork share about 50% of their genes, similar to any other siblings, because they come from two separate fertilized eggs.
Step-by-step explanation:
As dizygotic twins, Jewel and Bjork share about half of their genes. Dizygotic, or fraternal, twins are the result of two separate eggs being fertilized by two different sperm cells. This means that, like regular siblings, they share approximately 50% of their genetic material due to inheriting half of their genes from each parent. In contrast, identical twins develop from a single fertilized egg that splits into two, leading them to be genetically identical. So, to answer the question, the correct option is (d) share about half of their genes.