Final answer:
Fraternal twins, or dizygotic twins, usually do not share one placenta; instead, they each have their own placenta because they develop from two different eggs fertilized by separate sperm, making the statement false.
Step-by-step explanation:
The statement that fraternal twins usually share one placenta is false. Fraternal twins, also known as dizygotic twins, develop from two separate eggs that are fertilized by two separate sperm. Each twin typically implants in the uterus separately and develops its own placenta. In contrast, identical twins can share a placenta if they split from a single zygote at the early blastocyst stage. However, if the split occurs at the very early two-cell stage, identical twins will also have individual placentas. Fraternal twins are genetically as similar as regular siblings and having separate placentas underscores their genetic distinction.