What pattern of inheritance is shown in the pedigree?

The answer to this is A. Take note that it is not only the traits that can be passed down from one generation to another. There are times when disorders may also be passed down. For example, one parent has that gene. Even if it would not be passed down on the other people, there are some who would carry those traits or disorders dominantly.

This is the reason why some people may get allergies and even different diseases from their other relatives. It is best that you get to know more details about this especially if you are trying to trace the diseases that you have had.