Funny facts about humans, mammals, and genetics

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May 15, 2025
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Humans, like all mammals, belong to a class of organism labeled "duostomes." The funny thing about this is, whether you are talking about a human fetus, a whale fetus, dog fetus, whatever form of mammal you care to name, the very first part of the body that begins to form is ... the anus!

Yes, that's right: Every human being you see, have ever known, ever will know, was, once, just an asshole! Most of us grew out of it, though.

The other odd thing about mammals is: for placental mammals*, in the first six weeks after conception, the fetuses of all mammals all look pretty much identical. Human fetuses even have gill slits. Those later become salivary glands. (I had a friend who offered the opinion that this fact should make abortion more acceptable, if there is no difference between humans and animals. I asked her if maybe it meant that all fetuses are equally precious. She didn't like that. We're not friends anymore, even though she knows damn well I am a pro-choicer

Genitalia? It gets even more hilarious! Male or female, that equipment develops from the exact same structures in men and women! Look up the word "homologous," if you're confident enough in your masculinity. Men were made from female bits, women were made from male bits, however you want to think about it, the Lord has rendered how it is done.

There are some women who have XY chromosomes! They're called "intersex," and instead of ovaries tucked away in their abdomen, they have testes. Naturally, this makes them infertile. They produce as much testosterone as any man, but the gene that lets their body use the testosterone is defective, so they develop female. Some of them even get periods, and experience menopause, so there's no break from those particular joys of life! There is nothing that will tell you they are not female. In every detail! Most of them will never even know they are intersex. And in a final irony: because intersex women do not react to testosterone, they are almost all exceptionally beautiful women. We (we=human medicine and science) started discovering this facet of humanity when they started doing genetic testing in the Olympics, back int he late '60's/early '70's. It turns out intersex women often excell in sports, even though they do not get the advantages of all that testosterone in terms of musculature and bone density. Still, there does seem to be a bit of a boost in strength, endurance and speed, enjoyed by intersex women.

Chimerism! This one isn't funny. This one has led to divorces, and destroyed families, when there was no basis for this destruction. Ready? Here we go!

The kids have a science projevt at school. They are studying family genetics! Yay! They take cheek swabs and send them off, only to get back results that say dear old Dad is NOT where they got their genes from! Dad divorces Mom. Mom maintains throughout that she has not been unfaithful, and she doesn't understand how this could have happened!

There are several possible causes that can cause a father's children to not share his DNA!

1.) Fetal Twin syndrome. If the father was part of a twin in the womb, and he later consumed his twin prior to birth**, his twin's gene's can become what his semen creates! If they were fraternal twins, i.e., not identical, a man can be impregnating his wife with his consumed twin's genetics!

2.) Leukemia succesfully treated with bone marrow transfusion: If the father had Leukemia, and received a bone marrow transplant to put it in remission, the donor's marrow can, over time, re-write the husband's DNA, so that now his seed is that of the man who saved his life!

There's a truckload more to DNA and how freaking weird it can get! But the upshot is: we were meant to reproduce, and nature only cares that you do reproduce; and not whether or not you are happy about it, or with the result!

Life, the universe, and everything. Someone ought to sell tickets.

*As opposed to marsupial mammals, of course! NEVER kill a Possum! They are North America's ONLY marsupial mammal! And they eat ticks, bugs, snakes, can't catch rabies, don't want to get in your house. They only want to be left alone!

**Most of us started out as twins. Most of us consumed our twin while we still in the womb. Lesson: life is a motherfucker. You just have to be here. You do not have to be happy. But the time will go a lot more nicely if you can manage it.
 
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