Can men and women evolve sep­a­rately?

Focus-Science and Technology - - Q & A - LISA MILNE (AGE 14), LV

They have evolved sep­a­rately, which is why the two sexes are phys­i­cally dif­fer­ent. Evo­lu­tion has favoured men who have lots of chil­dren, so their bi­o­log­i­cal con­tri­bu­tion to re­pro­duc­tion is just a few millil­itres of cheaply pro­duced sperm. Women, on the other hand, need to sup­ply lit­er­ally all the en­ergy and nu­tri­ents re­quired to build a baby from scratch and feed it, so they’ve evolved a uterus, pla­centa and milk-pro­duc­ing breasts. How­ever, there is a limit to how far the sexes can di­verge. Men and women only dif­fer by one chro­mo­some – the Y chro­mo­some – and all the phys­i­cal and hor­monal dif­fer­ences be­tween the sexes ul­ti­mately have to fit into that one chro­mo­some.

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