Over simplified lah , bro
why ?
because that’s exactly what LKY thought too , hence he pursued his wife for brains and not beauty
But produced dud children and grandchildren both physically and mentally
so what is the answer ? The bet is still 1 to 10 , I reckon ,thus nature still holds the answer ...you see , in time of war when men dies and the subsequent ratio becomes 5 women for 1 man , somehow the nature corrects itself that most children born thereafter are male...don’t believe ?, do a search
Some attribute this phenomena to God , me ? Still lost and wondering