Color blindness is an X linked trait. Being colorblind is recessive and having normal vision is dominant. A color blind father and a mother who is a carrier for the disease have a child. Create a punnet square to show this cross

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.

the answer to your question is:

c. complementary base-pairing

yes, because even though a theory has a  lot of evidence to support it, it is not always true