DMIT Genetic & Developmental Basis of Fingerprints 2

Question 1

What is the term for the point in a fingerprint where ridge lines meet and diverge in three directions, forming a triangle-like structure?

Accepted Answer

Delta (triradius)

Answer

A triradius (also called a delta) is the point where three ridge systems meet at roughly 120-degree angles, and it is used to count ridges between the core and delta.

Question 2

Heritability studies suggest that fingerprint ridge count is:

Accepted Answer

Highly heritable, with genetics accounting for most of the variation

Answer

Twin studies have shown that total ridge count is highly heritable, with genetic factors accounting for approximately 80% or more of the variation between individuals.

Question 3

Which of the following conditions is NOT typically associated with distinctive dermatoglyphic patterns used in clinical genetics?

Accepted Answer

Huntington's disease

Answer

Huntington's disease is a single-gene neurodegenerative disorder that does not produce characteristic dermatoglyphic patterns, unlike the chromosomal aneuploidies listed.

Question 4

The formation of fingerprint ridge patterns is primarily influenced by which developmental process?

Accepted Answer

Dermal papilla proliferation and mechanical buckling of the epidermis

Answer

Fingerprint ridges form through mechanical buckling of the developing epidermis caused by differences in growth rates between the epidermis and underlying dermis, guided by dermal papillae.

Question 5

In DMIT, the ridge pattern found predominantly on a specific finger is believed to provide information about which corresponding brain region?

Accepted Answer

The associated lobe of the cerebral cortex

Answer

DMIT practitioners map specific fingers to corresponding lobes of the cerebral cortex, using the dominant ridge pattern on each finger to infer the relative development of that brain area.

DMIT - Dermatoglyphics Multiple Intelligence Test Practice Test

DMIT - Dermatoglyphics Multiple Intelligence Test Practice Test

DMIT Genetic & Developmental Basis of Fingerprints 2