Question:easy
Two identical (monozygotic) twins will NOT have the same:
Two identical (monozygotic) twins will NOT have the same:
Show Hint
Same genome shares everything except a trait shaped by random fetal events.
Updated On: Jun 23, 2026
- Fingerprints
- DNA copies
- Iris color
- Blood group
Show Solution
The Correct Option is A
Solution and Explanation
Step 1: Ask what feature is NOT genetically determined. Identical twins come from one zygote, so every gene-driven trait is shared between them.
Step 2: Blood group ($ABO$, $Rh$) is purely genetic, DNA sequence is by definition identical, and iris color is governed by inherited genes. All three will match in monozygotic twins.
Step 3: Fingerprint ridge patterns develop in the womb under random physical influences (fetal position, finger pad pressure, capillary flow) that are independent of the shared DNA.
Step 4: Therefore even identical twins end up with unique, non-matching fingerprints, which is why forensic identification relies on them.
\[\boxed{\text{Fingerprints}}\]
Step 2: Blood group ($ABO$, $Rh$) is purely genetic, DNA sequence is by definition identical, and iris color is governed by inherited genes. All three will match in monozygotic twins.
Step 3: Fingerprint ridge patterns develop in the womb under random physical influences (fetal position, finger pad pressure, capillary flow) that are independent of the shared DNA.
Step 4: Therefore even identical twins end up with unique, non-matching fingerprints, which is why forensic identification relies on them.
\[\boxed{\text{Fingerprints}}\]
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