This Week in Science

In Science this week, a team of Swedish and US scientists present a genomic analysis of species of finches from the Galapagos Islands, identifying the genetic locus associated with the differences in sizes observed by Charles Darwin, contributing to his principle of character divergence — a process of morphological divergence that reduces competition for limited resources. The researchers sequenced the genomes of six species of Darwin's finches that differ in size and related traits.

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Chinese state news agency Xinhua reports that a preliminary investigation has found He Jiankui performed his gene-editing work illegally.

John Mendelsohn, a former president of the University of Texas MD Anderson Cancer Center, has died, the New York Times reports.

Identical twins receive different estimates of ancestry from the same direct-to-consumer genetic testing firms, CBC reports.

In PNAS this week: chromosomal features of maize, adaptations in the vinous-throated parrotbill, and more.