Andrea Baccarelli loves black truffles—the fungi, not the chocolates. His parents, he says, are also fond of the delicacy. His grandparents liked them, too, as did his great-grandparents. Did he ...

In Mendelian inheritance patterns, you receive one version of a gene, called an allele, from each parent. These alleles can be dominant or recessive. Non-Mendelian genetics don’t completely follow ...

The development of the brain has been studied in detail in various organisms, and we know a lot about the genes and cells that are at work during the development of the central nervous system. It is ...