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

Core

Answer

Loop terminus

Answer

Ridge bifurcation

Question 2

Heritability studies suggest that fingerprint ridge count is:

Accepted Answer

Highly heritable, with genetics accounting for most of the variation

Answer

Entirely determined by environment

Answer

Equally determined by genetics and environment

Answer

Not heritable at all

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

Turner syndrome (45,X)

Answer

Klinefelter syndrome (47,XXY)

Answer

Down syndrome (Trisomy 21)

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

Melanocyte migration into basal skin layers

Answer

Keratinocyte apoptosis during fetal growth

Answer

Sebaceous gland secretion patterns

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

The quadrant of the cerebellum

Answer

The spinal cord segment

Answer

The corresponding cranial nerve

Question 6

What does a higher ridge count between the core and the delta of a fingerprint typically indicate in DMIT analysis?

Accepted Answer

Greater neural density or potential in the associated brain area

Answer

Lower activity in the corresponding brain region

Answer

A pathological chromosomal condition

Answer

Greater likelihood of a whorl pattern

Question 7

Which of the following best describes why fingerprints remain unchanged throughout a person's lifetime?

Accepted Answer

Epidermal ridges are anchored by permanent dermal papillae formed during fetal development

Answer

The dermis regenerates with the same pattern after injury

Answer

Ridge patterns are encoded in DNA and regenerate identically

Answer

The immune system prevents any modification of skin patterns