What terms do we use for monozygotic and dizygotic twins ? To which sex do these twins belong ?how are monozygotic twins different from conjoined twins ?

Explanation

Identical twins and fraternal twins .
Monozygotic twins are always of the same sex, whereas , dizygotic twins may be of the same or different sexes.
If the two blastomers separate before their fate is fixed , each can develop into a complete young one (monozygotic twins ) .On the other hand ,If these blastomeres are partially separated by zygote 's First clevage , conjoined twins will be formed i.e., twins joined together at certain places .