Twins.

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(1)The twins are of two type,viz.monozygotic or identical twins and dizygotic twins or fraternal twins.(2)Monzygotic twins are derived froma single zygote that splits at an early stage during development.They have same genetic constitution and are always of the same sex.(3)Dizygotic twins are formed rarely.When two ova are released simutaneousely from the ovaries and they are in turn fertilized bt two deifferent sperms then such sizygotic twins are formed.(4)Each fertilized ovum develops into embryo.It could be of the same sex or of the different sex.(5)Dizygotic twins are genetically dissimilar.
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