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It has been scientifically proven that the X an Y chromosome are the determinant factors in what sex an embryo will develop into, XX female, XY male. However, if the SRY gene doesn’t produce a functional protein, the sex characteristics of the embryo may be disrupted. genome.gov/about-genomi….
It has been scientifically proven that the X an Y chromosome are the determinant factors in what sex an embryo will develop into, XX female, XY male. However, if the SRY gene doesn’t produce a functional protein, the sex characteristics of the embryo may be disrupted. https://www.genome.gov/about-genomics/fact-sheets/Y-Chromosome-facts#:~:text=Typically%2C%20the%20Y%20chromosome%20is,direct%20lineage%20of%20male%20ancestors.
And I read recently that the male Y chromosome has been decreasing over the years so if there is not enough Y chromosome what happens to the fetus? This info came from a reputable source.
This may be coming about because of endocrine disruption chemicals, which is why there is a push to remove them from plastics.