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Repeated evolution: Lactose tolerance arose independently in Africans and Europeans
In January 2007, an international team of researchers led by geneticist Sarah Tishkoff announced that they had uncovered the genetic roots of Africans’ lactose tolerance. Just as in Europe, on this continent, mutations (in this case, probably three) randomly arose, and these happened to have the effect of keeping the lactase gene switched on. https://evolution.berkeley.edu/evolibrary/news/070401_lactose
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Repeated evolution: Among insect 236 families in 18 of 44 orders independently invaded water
just another extreme convergent evolution event … stuff happens … No insects returned to land after adapting to aquatic habits Due to different evolutionary rates or periodical changes in water characteristics, non-adapted terrestrial insects repeatedly invaded the aquatic realm with well adapted hydrobionts. The proposed reason for the lack of land return is the character of numerous aquatic adaptations […]