20th February 2024

A laboratory technician is currently attempting to test a sample for a CGG trinucleotide expansion

A laboratory technician is currently attempting to test a sample for a CGG trinucleotide expansion. He has taken the sample following processing with restriction endonucleases and applied this onto a gel membrane. A nitrocellulose sheet is applied onto the gel, and an electric charge is applied. A probe is applied to highlight the CGG segment, and the nitrocellulose sheet is exposed to X-rays to visualise the movement of the DNA segments.

Which of the following genetic tests is being described above?

Select the SINGLE most appropriate option from the list below. Select ONE option only.