Aboriginal Australian do, in fact, suffer from a disproportionate number of hereditary diseases: https://www.mja.com.au/journal/2020/212/5/lessons-learned-gene

Aboriginal Australian do, in fact, suffer from a disproportionate number of hereditary diseases: https://www.mja.com.au/journal/2020/212/5/lessons-learned-genetic-research-indigenous-australian-participants https://www.mja.com.au/journal/2020/212/5/lessons-learned-ge... While there is considerable genetic diversity between Aboriginals as a whole, the diversity of individual communities is often quite low, and in response many communities evolved elaborate kinship systems to avoid too much intermarriage.