A Northern blot probed for gene X shows a thick band in liver, a thin band in brain, and no band in muscle.
What does the figure most directly indicate?
- A
Gene X protein is largest in muscle.
- B
Brain expresses an alternatively spliced isoform of gene X.
- C
Liver has lost the gene X locus.
- Dcheck_circle
Gene X mRNA is most abundant in liver and not detectable in muscle.
Explanation
Northern blots detect mRNA. Band thickness reflects transcript abundance: liver expresses the most gene X mRNA; brain low; muscle below detection.