Biology · Genetics and Embryology
Identical (monozygotic) twins develop when:
- 1Two separate fertilized eggs merge into two complete embryos
- 2A single fertilized egg forms only one complete embryo
- 3Two separate fertilized eggs form two complete embryos
- 4A single fertilized egg splits and forms two complete embryos✓
Correct answer
A single fertilized egg splits and forms two complete embryos
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