Dethol nodweddion etifeddol dymunol mewn bodau dynol i wella cenedlaethau'r dyfydol yw ewgeneg.
Daeth y syniad i'r amlwg ar ddiwedd y 19g gyda Francis Galton a damcaniaeth Darwiniaeth Gymdeithasol. Diffygiodd y mudiad yn sgil yr Ail Ryfel Byd gan i ewgeneg gael ei chysylltu â'r Natsïaid.
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