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About Monozygotic twins

  1. Jan 25, 2010 #1
    Hello, Chitose wonder chick again.

    First to tell This is NOT a homework.

    ........................................................

    Monozygotic twins are twin from same agg right? wich mean Almost every of thier indentical (Sex, DNA, Chromosome, bra bra bra...).

    In some forum in my country their argue about does Monozygotic twins have the same fingerprint or not, so I ask you here.

    1. Dose Monozygotic twins hava the same finger print?

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    2.

    Miss A1 and A2 are Monozygotic twins.
    Mr. B1 and B2 are Monozygotic twins as well.

    If A1 marry B1 (or B2, same case)
    and A2 marry B2 (or B1, same case)

    What gonna happan to their kids? almost like twin? (but not twin)
    Are they gonna have same DNA even they not twin????

    If not, why?
    Both pair of parent havs same DNA right?
    because Mutation?

    ............................................................

    PS. English is not my native languge, forgive me if I'm wrong in gramma or spelling.
     
  2. jcsd
  3. Jan 26, 2010 #2

    arildno

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    1. No, they don't have identical finger prints.

    This tells us that finger prints at birth are more dominantly determined by the local environment within the uterus, rather than by genetic instructions.

    Since two fetuses sharing a womb will still experience somewhat different conditions, the variability in finger prints between monozygotic twins should be about the same as for heterozygotic twins.
     
  4. Jan 26, 2010 #3

    Ygggdrasil

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    Consider the case where A1 and B1 have a second kid. Since A1 has an identical genetic makeup to A2 and B1 has an identical genetic makeup to B2, this situation should be the same as A2 and B2 having a kid.
     
  5. Jan 26, 2010 #4
    I mean both pair have only one kid.
    what I wonder is son of A1 and B1 gonna have same genetic instructer to son of A2 and B2? (same as twins, not same as brother)
     
  6. Jan 26, 2010 #5

    Ygggdrasil

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    Well, first you should consider the case where A1 and B1 have two kids. In this case, will the two kids be identical. Why or why not?
     
  7. Jan 27, 2010 #6
    Oh I see... they just have identical as brother...
    (aww man... why i didn't though about this case earlier.)
     
  8. Jan 27, 2010 #7

    Ygggdrasil

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    Correct. If A1 and B1 have a child, AB1, and A2 and B2 have a child, AB2, then AB1 and AB2 will have the same relatedness as siblings.
     
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