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Step Twin

Genetics as it applies to evolution, molecular biology, and medical aspects.

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Step Twin

Postby Seasrmar » Mon Jul 26, 2010 5:06 am

Hi everyone, I don't know much about Biology, even less in Genetics. So what I am about to ask may sound stupid, but I'm really curious, but please hear me out.

Hypothetical situation, a male is with two females who are identical twins. If I am correct, identical twins have very close identical DNA. So if the male got the two females pregnant and transfer the same genetic materials in making the babies. And the sperms and eggs developed the same way. Could the two babies born of two identical twins females with the same genetic materials from the same male, be like step twin?
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Postby JackBean » Mon Jul 26, 2010 6:01 am

don't look so much to porn :lol:

Well, each sperm of the male contains different set of his maternal/paternal chromosomes (and they can be even combined, like half chromosome from mother and the other half from father), so the kids would not be identical.

(but BTW the identical twins have the same DNA, that's why are they identical;)
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Re: Step Twin

Postby Seasrmar » Mon Jul 26, 2010 5:13 pm

:lol: I assure you, it's not porn related; pure academic interest for a hypothetical situation. Some cultures practice sororal polygyny- marriage in which the wives are sisters. The sisters can be identical twin.

Thanks for answering my question though. If I may expand on it further. Isn't there a chance that two or more sperm be a like ie: carry the same genetic materials. As you say, it can carry the male's father, mother, or a combination of both. Ok, regardless of which one of the above, can two sperm be a like ie: both carry only male's father, mother, or same combination of both. Now combine with the twin. Voila, step twin. :lol:
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Postby JackBean » Mon Jul 26, 2010 6:20 pm

well, you have approx. 3.10^9 bp in 23 pairs of chromosomes (taking X and Y as a pair;), so you can have 2^23 possibilities, how to combine your chromosomes and than theoretically 3.10^9 possibilities of crossing-over. Of course, you have several billions (or what are the numbers in English) of sperms only in one shot ( :lol: ), so count it by yourself, what is higher number ;)
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Postby canalon » Mon Jul 26, 2010 7:23 pm

Are two siblings identical?
Because their parents have the exact same genetic make-up, and yet no one have a problem to pinpoint who is who in the family :)
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any proof. (Ashley Montague)
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Postby JackBean » Mon Jul 26, 2010 8:51 pm

IMHO that's kind of "parent's sense", because other people can be easily confused usually ;)
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Step Twin

Postby Seasrmar » Thu Jul 29, 2010 5:05 pm

I like my odds. :lol:
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Postby JackBean » Mon Aug 02, 2010 7:59 am

BTW you can't forget, that the twins have identical DNA, but DNA in their eggs won't be identical, right? ;)
*So, the chance of them getting the same DNA subset is the same as for yours two sperms;)
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Re: Step Twin

Postby fastsandslash » Thu Aug 05, 2010 3:42 am

Now, actually this is possible. Some prerequisites involve:
Identical twins or sisters with at least enough identical DNA to produce an egg each, of which contain identical DNA.
A father, frick god, who can produce at least two identical sperm which at least one reaches each egg before all other sperm.

The odds of that would be less than winning Lotto Powerball 800,000 times consecutively. If this did happen, God call me rich XDDDD!!!
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Postby JackBean » Tue Aug 10, 2010 7:42 am

yeah, I guess that has been said before ;)
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