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which gene does they 'y' chromosome contain?

that does what?

production of testosterone then informs developing foetus to take on?

what happens to the brain because of this?

and the foetus develops which two masculine characteristics?

HORMONES - OESTROGEN

lack of 'y' chromosome in an ** embryo also means lack of which gene?

therefore what instruction lacks?

therefore developing sex organs then become?

which produce hormones such as?