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The professor continues: 'The evolution exam has two papers.

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'Niall's chromosome proves how, for centuries, just the mightiest passed on their genes.'Men can score higher than women, for females are limited in their success by the mechanics of pregnancy, while males are free to spread their sperm to a multitude, if they can find them.Some societies still turn on that simple biological fact.A fifth of the men of Donegal share the same Y chromosome - the mark of male descent - and trace ancestry from the same man.In Old Erin's glorious days, marital bliss was an exception.'Turlough O'Donnell, who died in 1423, had 18 sons.