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WHY DO IDENTICAL TWINS LOOK EXACTLY THE SAME?


Identical twins happen when a single sperm (male cell), fertilizes a single egg (female cell) that then splits in two. Each one goes on to grow into a baby, but both cells share exactly the same genetic instructions (DNA) .

DOUBLE (OR TRIPLE) TROUBLE!
The number of births in which twins or triplets are likely to occur naturally:
1: Identical twins
     4 in 1000 births
2: Non-identical (fraternal) twins
    15 in 1000 births
3: Identical triplets
     1 in 100000 births
4: Non-identical triplets
     1 in 8000 births
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