Having said that, it is conceivable for litter mates to appear significantly different from each other while still sharing the same father. This is due to the fact that cats have dominant and recessive genes, such as blue eyes or short hair, which can result in a wide range of kittens with varying eye colors and fur lengths. Even though they share the same DNA code, some genes may be activated or suppressed during development depending on what kind of protein binds to them. This can cause differences between two identical twins. For example, one twin may have blue eyes while the other has brown eyes. This would indicate a presence of a gene for blue eyes that is not expressed in the developing kitten. Conversely, both twins might have brown eyes, yet only one of them could possibly be born with white paws; this would mean that a brown-eyed cat had its white paw gene turned off during development. It's also possible for two kittens to be completely identical except for one thing: one may be black and the other white. This shows that even two littermates can come out looking quite different because certain genes are activated or suppressed during development. It's also important to remember that genetics only accounts for why they look differently; it doesn't tell you who will develop what traits. Two genetically identical individuals may still get developed into two very different people. This is where environment comes into play. The way an animal is raised after birth can affect how it develops; this is why you often see big differences between litter mates.