What Is Unusual About the Inheritance of Retinoblastoma, Given That

Multiple Choice

What is unusual about the inheritance of retinoblastoma, given that it appears to be inherited as a dominant trait?

A) All children who inherit one copy of the RB deletion develop retinoblastoma.
B) Not all children who inherit the RB deletion develop retinoblastoma.
C) No children who inherit the RB deletion develop retinoblastoma.
D) Only boys appear to develop retinoblastoma.
E) Only girls appear to develop retinoblastoma.