Final answer:
Identical twins, also known as monozygotic twins, are twins that look exactly alike because they developed from a single fertilized egg and share identical genes.
Step-by-step explanation:
The twins that look exactly alike are called identical twins. Identical twins occur when a single fertilized egg splits and develops into two individuals with identical genes. Despite their genetic similarity, identical twins can still exhibit differences due to environmental factors and various experiences, highlighting the intricate interplay between nature and nurture in human development. While identical twins share all of the same genes and are a perfect genetic match to one another, fraternal twins are no more genetically similar than regular siblings.