Can a boy and a girl twin be identical? Fraternal twins will not be identical and can be either the same sex or a boy and a girl Identical twins This is when only one egg is fertilized, and the zygote splits into two early in pregnancy, forming two embryos Identical twins have the same chromosomes, and will look the same and be the same sex Implantation in the womb This is due to the twins not sharing the same DNA like identical twins and are physically different in appearance Fraternal twins occur when there are two separate eggs which are fertilised by two separate sperm cells With fraternal twins you can have either two girls, two boys or boy and a girl combinations
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