Pedigree Analysis Was Used to Determine Whether a Genetic Marker

Pedigree analysis was used to determine whether a genetic marker is inherited with a disease trait (black circle) . Results of Southern blot analysis of restriction endonuclease-digested DNA from members of the family are shown. What conclusions can be drawn from the data?

A) A restriction fragment length polymorphism (RFLP) is linked to this autosomal recessivetrait.
B) A restriction fragment length polymorphism (RFLP) is linked to this autosomal dominanttrait.
C) The disease is caused by expansion of a trinucleotide repeat.
D) No information can be gained from this analysis because researchers should haveperformed a Northern blot, not a Southern blot.