One boy has brown eyes. His twin brother has blue eyes. This information enables a person to conclude that the two ______________?
Correct answer: B. are fraternal twins
- A. are identical twins
- B. are fraternal twins
- C. are monozygotic
- D. have blue-eyed parents
Explanation
Different eye colours strongly indicate fraternal, or dizygotic, twins in standard developmental-genetics questions because they arise from two separate eggs and sperm. Identical, or monozygotic, twins usually share the same genetic makeup and eye colour.
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