How many questions are in this quiz?

This quiz has 116 questions covering STR profiling and mixture interpretation fundamentals.

No. There is no timer, so you can take your time and think through each scenario.

What answer format does the quiz use?

Every question is multiple-choice with 4 options, and you select the single best answer.

Does it cover DNA mixtures and artifacts like stutter or drop-out?

Yes. You’ll see questions on mixtures, major/minor contributors, and common interpretation pitfalls such as stutter, drop-in, and drop-out.

How do I choose the length and difficulty?

Before starting, pick how many questions you want and set the difficulty; the mixed setting blends basic definitions with applied interpretation.

DNA profiling fundamentals: STRs and mixtures

About this quiz

What you’ll learn and practice

Work through the essentials of STR-based DNA profiling, including allele naming, genotype patterns, and how profiles are compared in casework.

Mixture interpretation is a major focus too—expect scenarios that test contributor count, major/minor components, and when a profile is not suitable for comparison.

Quiz format and difficulty settings

Each question has 4 options and there’s no timer, so you can slow down and reason through electropherogram-style logic and terminology.

Choose your question count before starting, and select an easier or harder mix depending on whether you want quick revision or deeper challenge; the overall difficulty is balanced by blending straightforward definitions with applied interpretation.

Common pitfalls to avoid

Confusing allele count with contributor count in mixed samples
Treating stutter, drop-in, or drop-out as definitive alleles without context
Forgetting that homozygotes can look like “missing” alleles at a locus
Over-interpreting low-level peaks or partial profiles beyond what they support
Mixing up match statements, exclusions, and “inconclusive” outcomes

Tips to improve your score

Aim to justify each choice with a simple rule (e.g., peak patterns per locus, major/minor logic, or artifact awareness) rather than guessing from buzzwords.

If you miss a question, revisit what assumption failed—most errors come from skipping a constraint like peak height balance, locus-by-locus reasoning, or the limits of partial data.