Boy/girl twins are always fraternal or (dizygotic); they can only form from two separate eggs that are fertilized by two separate sperm. The terms identical and fraternal dont describe what the twins look like, but actually how they form. Two girl twins: Can be either identical or fraternal (monozygotic or dizygotic)

Can a boy and a girl twin be identical?

In 99.9% of cases boy/girl twins are non-identical. However, in some extremely rare cases resulting from a genetic mutation, identical twins from an egg and sperm which began as male (XY) can develop into a male / female pair.

Are identical twins maternal or fraternal?

The main difference between maternal and paternal twins is that maternal twins are genetically-identical whereas paternal twins are non-identical twins. Maternal twins are also called identical twins or monozygotic twins. They are formed by the splitting of the fertilized egg.

What is monozygotic and dizygotic twins?

To form identical or monozygotic twins, one fertilised egg (ovum) splits and develops into two babies with exactly the same genetic information. To form fraternal or dizygotic twins, two eggs (ova) are fertilised by two sperm and produce two genetically unique children.

What are the names for twins?

Twin Boy & Girl NamesAbigail, Benjamin.Abigail, Jacob.Addison, Jackson.Aiden, Emma.Alexander, Sophia.Andrew, Emma.Annabelle, Leonard.Cameron, Matthew.More items •8 Jun 2021

How can I become pregnant with twins?

Conception happens when a sperm fertilizes an egg to form an embryo. However, if there are two eggs present in the womb at the time of fertilization or the fertilized egg splits into two separate embryos, a woman can become pregnant with twins.