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Human Gamete Compatibility Going Backwards

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Human Gamete Compatibility Going Backwards

Postby BiologicalRush » Thu Jan 02, 2014 7:08 pm

If one could take a human gamete from today and 'test' it for compatibility against every birth of every creature starting at the most recent birth and going backward in time, would one reach a first-to-produce a compatible gamete individual? By 'compatible' I mean able to form a zygote that results in a fertile, viable offspring.
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Postby Cat » Sun Jan 05, 2014 5:40 pm

Depends how you want to go about doing it. From in vitro stand point the main requirement is same number of chromosomes - therefore, Reeves's Muntjac and Sable Antelope could be fully "compatible" with humans. I don't think anyone tested this in vivo...
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Postby JackBean » Mon Jan 06, 2014 10:10 am

@Cat
it's not that simple. Przewalski and domestic horse differ in chromosome number, yet they are able to produce viable offspring
http://en.wikipedia.org/wiki/Przewalski ... e#Taxonomy
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.
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Postby JackBean » Mon Jan 06, 2014 10:11 am

on the other hand, although we may have the same number of chromosomes as antelopes, they will be hardly homologous so there will be no cell division
http://www.biolib.cz/en/main/

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Postby Cat » Sat Jan 11, 2014 7:56 pm

Nice examples JackBean. Another one would be normal human + human with extra Y chromosome... Anyway, all I was trying to say is that because of the ethical considerations compatibility of humans with other species was not and probably will never be tested.

Your point on homology, however, may or may not be relevant. Theoretically, haploid genome should be sufficient to produce an organism as it contains full complement of genes. However, because some critical genes can be recessive, two copies are required. This leads to the requirement for the homologous gene from the second parent. In theory, if neither parent organism has any such genes, the organisms are "compatible". Once embryo is formed, the new genome will dictate appearance of a new organism (whether it's going to be a hoof or a hand). Unless there is a serious clash between the two organisms that cannot be reconciled, a hybrid will be born. This hybrid will not breed true and can only be considered a first step toward the creation on new species...
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Re: Human Gamete Compatibility Going Backwards

Postby JackBean » Fri Jan 17, 2014 10:07 am

BiologicalRush wrote:By 'compatible' I mean able to form a zygote that results in a fertile, viable offspring.

my emphasis
http://www.biolib.cz/en/main/

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