Can identical twins be male and female?

Fraternal twins are two genetically unique individuals as they come from two separate eggs that are fertilized by separate sperm. The resulting egg/sperm combination can be male or female. The result is either two male twins, two female twins, or one male and one female. read more

Twins of different genders are universally accepted as a sound basis for a clinical determination that boy and girl twins are not identical. However, in very rare cases, boy and girl twins can stem from the same egg, like identical twins do. Occasionally and egg contains three sex chromosomes XXY. read more

Dr. Frederiksen responded: Identical twins. Identical twins are always the same sex . They have the same genetic endowment. Fraternal twins are siblings that were in utero together. Fraternal twins can be the same sex or the opposite sex. read more