Forensic Biology And DNA Analysis – Blood, Semen, And Skeletal Remains Practice Exam

What is a common conclusion about using Amelogenin for sex determination across populations?

Not always reliable due to deletions or rare anomalies in some populations. Always reliable across populations. Only indicates age. Only for distinguishing one individual.

Correct Answer:

Not always reliable due to deletions or rare anomalies in some populations.

Explanation:

Amelogenin is useful because it compares X- and Y-linked copies of a gene, so a typical male sample yields two bands (one from X, one from Y) and a female sample yields a single X-band. But this approach isn’t perfect across all populations because deletions or rare variants in the AMEL genes can prevent the Y-band from amplifying or produce unusual patterns. If AMELY is deleted or its primer binding is disrupted, a male may appear female, or a null allele could complicate interpretation. These known anomalies mean Amelogenin isn’t universally reliable, so it’s best used as a first screen and should be corroborated with additional sex-determining markers (like SRY or other Y-chromosome markers) when precise determination is critical.

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