Question

question 11

friction ridges seen in finger, palm and foot prints are different among various people but very similar between identical twins. this evidence suggests which of the following?

a - that friction ridges allow for better tactile sensation.
b - that friction ridges aid in gripping.
c - that friction ridges are genetically determined.
d - that friction ridges change over time.

Explanation:

Analyze the question stem

The question states that friction ridges (fingerprints, palm prints, and footprints) are unique among different individuals but highly similar between identical twins. We need to determine what this evidence suggests.

Evaluate the options based on genetic evidence

Using the Epidermal Ridges knowledge point:

• Identical twins share \(100\%\) of their genetic material.
• The high similarity in friction ridge patterns between identical twins, contrasted with the high variability among unrelated individuals, strongly indicates a genetic basis for their development.
• Options A and B describe physiological functions (tactile sensation and grip), which are not directly supported by the comparison between individuals and identical twins.
• Option D is incorrect because friction ridges remain permanent and do not change over time.
• Therefore, the evidence directly supports that friction ridges are genetically determined.

Answer:

• A - That friction ridges allow for better tactile sensation.
• B - That friction ridges aid in griping.
• C - That friction ridges are genetically determined. (Correct answer)
• D - That friction ridges change over time.