B-This person is a carrier, and from the DNA you can see the person has the defective gene due to the extra line. But if you look at the Northern and Southern blots they appear normal and this indicates that the individual does not display the traits.
C-This person has a defective gene, therefore does not make protein Y, leading to the disease.
D-This person has a normal gene however there is a problem with transcribing the mRNA and this leads to absence of the Y protein
E-This person has a normal gene, and mRNA but no protein leading to the idea that there is a problem translating
F-This indicates that the person has a normal DNA, mRNA, and protein synthesizer but is suffering from external problems.