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TWINS

TWINS

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MONOZYGOTIC TWINS

• Monozygotic twins develop froma single egg, fertilized by a single

sperm, that splits into twoembryos;

• They have 100% percent of theirgenes in common.

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• Identical twins

• Always the twins are of

same sex

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DIZYGOTIC TWINS

• Dizygotic twins develop fromtwo eggs fertilized by two

separate sperm;

• They have, on average, 0% oftheir genes in common.

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Nonidentical twins!

May "e of same sex or di#erent

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CON$OINT%D TWINS

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 !hang "left#and $ng "111&

1'(# werefamo)scon*oined twins.+orn in iam,now Thailand.They wereknown as

Siamese Twins.+)t medicallyand ethically,

s)ch sibilings

http://en.wikipedia.org/wiki/Thailandhttp://en.wikipedia.org/wiki/Thailand

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Photo of Siamese

twins Eng and

Chang.Circa 1869.

They were the

original Siamese

twins who toured

with P. T.

Barnums Circus

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“Two-headed” baby

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Reason : Failure of embryo to split completely .One of the conjoined twins fails to develop fullyin the womb. Name of the Child is Manar

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CON$OINT%D TWINS )SIAM%S% TWINS

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bigail and +rittany /ensel

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h Th t d 1 tl 2

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heThey t)rned 1 recently 2

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Driving 2

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 The parent 3 the hybrid4

5enetics226

h *

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Than*

Yo+

Than

Y