How do conjoined twins form?
by 
Erin Albrecht
ANSWERS: 2
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Conjoined twins result when the zygote of identical twins fails to completely separate. That being said, identical twins occur when a single zygote, that is, a fertilized egg, divides into two seperate embryos. The embryos will then, with all conditions met, develop into fetuses sharing the same womb. When the zygote doesn't fully seperate, the embryos develop into fetuses without dissolving their connection. Conjoined twins are always identical; fraternal (non-identical) twins are the result of two seperate eggs being fertilized by two seperate sperm and being so, avoid the incomplete division necessary to form conjoined twins.
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Conjoined twins form when the fertilised egg of identical twins dosn't seperate, so the twins end up joined.
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