Question:
Two identical (monozygotic) twins will NOT have the same:
Two identical (monozygotic) twins will NOT have the same:
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Same genome shares everything except a trait shaped by random fetal events.
Updated On: Jun 23, 2026
- Fingerprints
- DNA copies
- Iris color
- Blood group
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The Correct Option is A
Solution and Explanation
Step 1: Monozygotic (identical) twins arise from a single fertilized egg, so they share the same genome. This means their DNA, blood group, and inherited eye-color genes are identical, and DNA fingerprinting cannot tell them apart.
Step 2: Fingerprints (dermatoglyphics/dactylography) are formed during fetal life by a mix of genetic and random intrauterine factors such as pressure, position, and amniotic fluid flow. These factors differ even between twins sharing a womb.
Step 3: Because of this, the friction-ridge patterns of identical twins are always different and remain unchanged for life, making fingerprints the reliable way to distinguish them.
Step 4: DNA copies and blood group are genetically determined and identical in monozygotic twins, so they are wrong. Iris color is also under genetic control and is essentially the same. Hence the correct answer is fingerprints.
Step 2: Fingerprints (dermatoglyphics/dactylography) are formed during fetal life by a mix of genetic and random intrauterine factors such as pressure, position, and amniotic fluid flow. These factors differ even between twins sharing a womb.
Step 3: Because of this, the friction-ridge patterns of identical twins are always different and remain unchanged for life, making fingerprints the reliable way to distinguish them.
Step 4: DNA copies and blood group are genetically determined and identical in monozygotic twins, so they are wrong. Iris color is also under genetic control and is essentially the same. Hence the correct answer is fingerprints.
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