How twins are formed ?
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identical twins occur when a single fertilised egg splits into two eggs. they are almost alike and share exact genes and have equal sex.
now, fraternal twin occur when two separate eggs are fertillised by two different sperms. they don't look alike, don't share same genes . they may be a brother and a sister or a brother and a brother or a sister and sister.conjoined twins are born in a very cases . they look alike and are attached to each other
hope it helps . if there are further you may ask me