In humans, each person's DNA sequence is unique except for which individuals, who typically share (nearly) identical nuclear DNA?

• A. A parent and their biological child
• B. Dizygotic (fraternal) twins
• C. Monozygotic (identical) twins
• D. Any two siblings from the same parents

Answer: (C)

Verified step by step guidance

1. Understand that nuclear DNA is inherited from both parents and is unique to each individual except in special cases.
2. Recognize that monozygotic (identical) twins originate from a single fertilized egg that splits into two embryos, resulting in nearly identical nuclear DNA sequences.
3. Contrast this with dizygotic (fraternal) twins, who come from two separate eggs fertilized by two different sperm, so their DNA is similar but not identical.
4. Note that a parent and their biological child share about 50% of their nuclear DNA, but their sequences are not identical.
5. Similarly, any two siblings from the same parents share roughly 50% of their DNA on average, but each sibling's DNA sequence is unique.