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Fraternal and Identical

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Twins FRATERNAL AND IDENTICAL Not true . Twins are Not born from 2 sperm, entering the same egg that would cause a polyploidy condition (plants not animals ... – PowerPoint PPT presentation

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Title: Fraternal and Identical


1
Twins
  • Fraternal and Identical

2
Not true.
  • Twins are Not born from 2 sperm, entering the
    same egg that would cause a polyploidy
    condition(plants not animals)
  • Miscarriage

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Identical Twins
  • Are an enigma and a miracle
  • Monozygotic
  • One egg is released.one sperm meets it and gets
    inside
  • The cell starts to divide
  • 1-2-4-8-16

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  • http//piccano.com/9-portraits-of-identical-twins-
    do-they-really-look-identical/

8
Identical
  • Monozygotic twinning occurs in birthing at a rate
    of about three in every 1000 deliveries
    worldwide.14
  • The likelihood of a single fertilization
    resulting in monozygotic twins is uniformly
    distributed in all populations around the
    world.12
  • The exact cause for the splitting of a zygote or
    embryo is unknown.

9
  • Kristy and Jamie Bono

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Fraternal
  • Fraternal or dizygotic (DZ) twins usually occur
    when two fertilized eggs are implanted in the
    uterus wall at the same time.
  • When two eggs are independently fertilized by two
    different sperm cells, fraternal twins result.
  • The two eggs, or ova, form two zygotes, hence
    the terms dizygotic and biovular.

12
Fraternal
  • Kenny and Kevin Johansen

13
  • ranges from about six per thousand births in
    Japan (almost similar to the rate of identical
    twins, which is around 45) to 15 and more per
    thousand in some parts of India16 and up to
    over 20 in some Central African countries.8

The Yoruba present the highest dizygotic twinning
rate in the world (4.4  of all maternities).
14
Fraternal
  • dizygotic twins may look similar, particularly
    given that they are the same age. However,
    dizygotic twins may also look very different from
    each other.
  • They may be of different sexes or the same sex.
    The same holds true for brothers and sisters from
    the same parents, meaning that fraternal and/or
    sororal twins are simply siblings who happen to
    be the same age.

15
  • Dizygotic twins are also more common for older
    mothers, with twinning rates doubling in mothers
    over the age of 35.12 With the advent of
    technologies and techniques to assist women in
    getting pregnant, the rate of fraternals has
    increased markedly.

16
  • In-vitro fertilization techniques are more likely
    to create dizygotic twins. Only about three pairs
    of twins per 1,000 deliveries occur as a result
    of natural conception, while for IVF deliveries,
    there are nearly 21 pairs of twins for every
    1,000.17

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Black and White twins
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  • New phenomenonthe baby is not an albino

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Siamese Twins Conjoined
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Parasitic Twins
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  • http//www.youtube.com/watch?vUzm_nQuES9wfeature
    player_embedded

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  • Goddess Lakshmi is the consort and shakti, or
    potency, of Lord Vishnu. Lakshmi, or Sri when she
    is especially known as the goddess of beauty
    (though sometimes considered to be separate
    entities), is the Goddess of fortune, wealth,
    power, and loveliness.

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