Answer:
Monozygous twins can be described as the twins which arise from the same egg. A single egg divides into two zygotes to form the monozygotic twins. Such kind of twins are are also known as identical twins.
In a pedigree chart, the monozygotic twins are represented by a a horizontal line connecting the two diagonal lines that lead down to the gender symbols. A horizontal line between the children hence depicts that they are identical twins.
