Question

Is it possible to be a carrier for SCID? If so, who are the possible carriers in this pedigree? Are there any individuals that must be carriers? If so, who are they?

Answer 1

Explanation:

All males who inherit the mutation will be affected, and all females who inherit the mutation will be carriers. Because it is not possible for a male to be an unaffected carrier of X-linked SCID, parents cannot both be carriers of this type.