Zoology - Principles of Inheritance and Variation Question with Solution | TestHub

In pedigree symbols, if there is a marriage between relatives it is represented by a double line between the couple. According to this symbol, both the children are born at the same time and they are connected. This represents that they are identical twins or monozygotic twins. If there would have been an absence of a horizontal line between children, it would mean that they were non-identical or dizygotic twins.