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> It has two driving parts:
> 
> https://www.sciencedaily.com/releases/2020/10/201002105756.htm
> 
> "An international research collaboration with The University of Queensland found the Y-chromosome gene that makes mice male is made up of two different DNA parts, not one, as scientists had previously assumed.
> 
> "'Expression of the Y chromosomal gene Sry is required for male development in mammals and since its discovery in 1990 has been considered a one-piece gene," he said.
> 
> "'Sry turns out to have a cryptic second part, which nobody suspected was there, that is essential for determining the sex of male mice. We have called the two-piece gene Sry-T."
> 
> "The scientists tested their theory and found that male mice (XY) lacking in Sry-T developed as female, while female mice (XX) carrying a Sry-T transgene developed as male.
> 
> "The success rate for the experiments was almost 100 per cent.
> 
> ***
> 
> "'Sry is a master switch gene because it flicks the switch for male development, it gets the ball rolling for a whole series of genetic events that result in a baby being born as a male instead of female.
> 
> "'This new piece of the gene is absolutely essential for its function; without that piece, the gene simply doesn't work.
> 
> "'We've discovered something massively important in biology here, because without Sry there can be no sexual reproduction and hence no propagation and survival of mammalian species.'"
> 
> Comment: We do not understand how sexual reproduction first started or how it happened. Obviously male and female have to be present. Now we see both male and female DNA are needed in a special way. There is  no way chance caused this arrangement since both parts must be simultaneously present. Only by design fits.