Question

What symbol represents monozygotic twins in a pedigree chart?

Options

• Two symbols connected by separate lines from a single point above them

• Two identical symbols placed directly next to each other

• Two symbols connected by a single arched or curved line from a single point above them

• Two symbols in different generations connected by a vertical line

Answer 1

Monozygotic (identical) twins are represented by two symbols connected by a single arched or curved line that originates from a single point above them. This notation indicates that both twins came from a single fertilized egg that split, making them genetically identical.