This Week in Science

In this week's Science, a team led by Johns Hopkins University researchers reports the first synthetic eukaryotic chromosome, which was developed from Saccharomyces cerevisiae. The eukaryote's genome includes 12 million nucleotides, and the scientists focused on yeast chromosome III, which contains more than 2.5 percent of those nucleotides. After using software to amend certain portions of the chromosome, the researchers built a version of it from individual nucleotides.

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The London School of Economics' Daniele Fanelli argues at the Proceedings of the National Academy of Sciences that the reproducibility crisis in science isn't as dire as some say.

A team of researchers in Portugal has examined the genomic basis for racing pigeons' athleticism and navigational skills, finding it's likely polygenic.

Wired reports that diagnostic firms continue to seek, post-Theranos, the ability to diagnose diseases from small amounts of blood.

In Science this week: analysis of DNA from ancient North Africans, and more.