Is this surprising information ?
ScienceAlert website:It may come as a surprise to some of our male readers, but you all actually started out as females - physically and phenotypically speaking. So how is this possible? Well, we all know that when a man and a woman make a tiny human, they each provide 23 chromosomes.One pair of chromosomes helps to determine the baby's sex - two X chromosomes and it'll be a female and an X chromosome from the mother and a Y chromosome from the father and it'll be a male. The key here, explains the episode of AsapSCIENCE above, is that the Y chromosome doesn't kick in right away.
- SmegheadLv 71 month ago
This is nonsense. It's commonly repeated nonsense, but it's nonsense nonetheless. To claim that the state of a fetus before secondary sex characteristics begin development is "female" is not only meaningless garbage, but it's more than slightly insulting to women.
The kernel of truth at the core of this wad of stupid is that the final sex of the human is determined by the presence or absence of the Y chromosome - more specifically, the presence of a functional SRY gene, which acts as a "master switch" for maleness. In the absence of such a switch (and a functional downstream pathway), the fetus will develop into a female.
But men absolutely do NOT "start off" as female. That's just idiotic.
- Anonymous1 month ago
That is misleading. Women have uteruses and ovaries. Male babies never had anything like that even when they are in the womb. Therefore to suggest that human fetuses all start out as women would be incorrect.
- Ted KLv 71 month ago
Never heard of "sciencealert" website. If it says what you claim it says, then it's a source of misinformation. But the simpler explanation is that you just didn't understand what you read.
We all start out as indeterminate--IOW, it can go either way. If you get a Y chromosome from the sperm, the SRY gene on that Y specifies genetic male, the Mullerian duct degrades and the Wolffian duct develops, and you end up with testes instead of ovaries. But if the sperm brings in an X, giving you two X's, then there is no SRY gene and the reverse occurs--Mullerian duct is preserved, Wolfian duct is resorbed and you are genetic female with ovaries.
- JazSincLv 71 month ago
Was there a question in there?
Anyway, it's bogus. We all start out as little spheres. Then we become spheres with a hollow inside. Then various other shapes.
For some time the embryo is tailed, but it would be silly to say "physically and phenotypically speaking we have a tail."
Our pharyngeal pouches and arches don't go on to become gills or an endostyle.
Be less silly.