DMIT Fingerprint Patterns & Dermatoglyphics Basics 1 — Questions and Answers
Question 1: What is dermatoglyphics?
- The scientific study of fingerprint and skin ridge patterns (Correct answer)
- The study of skin diseases
- A branch of genetics studying DNA
- The analysis of palm lines
Correct answer: The scientific study of fingerprint and skin ridge patterns
Dermatoglyphics is the scientific study of fingerprint patterns, palm prints, and skin ridge configurations on the fingers, palms, toes, and soles.
Question 2: Which of the following is the most common fingerprint pattern type?
- Arch
- Loop (Correct answer)
- Whorl
- Composite
Correct answer: Loop
The loop pattern is the most common fingerprint type, found in approximately 60–65% of the population.
Question 3: At approximately what stage of fetal development do fingerprints fully form?
- 8 weeks
- 12 weeks
- 21 weeks (Correct answer)
- 32 weeks
Correct answer: 21 weeks
Fingerprints are fully formed by approximately the 21st week of fetal development and remain unchanged throughout a person's lifetime.
Question 4: What does the term 'ridge count' refer to in dermatoglyphics?
- The number of fingers analyzed
- The number of ridges between the triradius and core of a pattern (Correct answer)
- The total number of whorls on all fingers
- The depth of fingerprint grooves
Correct answer: The number of ridges between the triradius and core of a pattern
Ridge count is the number of ridges intersected by a line drawn from the triradius to the core of a fingerprint pattern.
Question 5: Which fingerprint pattern is characterized by ridges that enter and exit from opposite sides of the finger?
- Whorl
- Arch
- Loop (Correct answer)
- Tented arch
Correct answer: Loop
In a loop pattern, ridges enter from one side, recurve, and exit from the same side, distinguishing it from the arch where ridges flow from one side to the other.
Question 6: What is a triradius (also called a delta) in fingerprint analysis?
- The center point of a whorl
- A point where three ridge systems meet at approximately 120-degree angles (Correct answer)
- A scar that alters fingerprint patterns
- The outer boundary of a fingerprint
Correct answer: A point where three ridge systems meet at approximately 120-degree angles
A triradius or delta is a point on a fingerprint where three ridge systems converge, meeting at roughly 120-degree angles, used as a reference for ridge counting.
DMIT Fingerprint Patterns & Dermatoglyphics Basics 1
What is dermatoglyphics?