how a twins born....
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There are 2 types of twins
- identical : When embryo gets divided to 2 then it is a identical twin and both sexes are sama
- unidentical : When 2 sperms fuse with 2 ova , a unidentical twin is born sexes may be same or separate
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Identical twins occur when a single fertilized egg splits into two. Identical twins look almost exactly alike and share the exact same genes. Most identical twins happen by chance. Fraternal twins occur when two, separate eggs are fertilized by two, separate sperm.
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