The Race Where Children are Fathered by the Tribe

The key to the understanding of this race is, I believe, its strange method of reproduction, which was essentially communal. Every individual was capable of budding a new individual; but only at certain seasons, and only after stimulation by a kind of pollen emanating from the whole tribe and carried on the air. The grains of this ultra-microscopically fine pollen dust were not germ cells but "genes," the elementary factors of inheritance. The precincts of the tribe were at all times faintly ...

 How to Resurrect a Species

The genome of a closely related species will have a high proportion of identical DNA, so it can serve as a blueprint, or “scaffold.” The passenger pigeon’s closest genetic relative is the band-tailed pigeon, which Shapiro is now sequencing. By comparing the fragments of passenger-pigeon DNA with the genomes of similar species, researchers can assemble an approximation of an actual passenger-pigeon genome. [...] Next the genome will have to be inscribed into a living cell... Molecular biolog...

 Each of Us is Ordinary, Yet One of a Kind

Each of us is ordinary, yet one of a kind. Each of us is standard issue, conceived by the union of two germ cells, nurtured in a womb, and equipped with a developmental program that guides our further maturation and eventual decline. Each of us is also unique, the possessor of a particular selection of gene variants from the collective human genome and immersed in a particular family, culture, era, and peer group. With inborn tools for adaptation to the circumstances of our personal world,...

 Cancer as a Microevolutionary Process

The body of an animal operates as a society or ecosystem whose individual members are cells, reproducing by cell division and organized into collaborative assemblies or tissues. In our earlier discussion of the maintenance of tissues (Chapter 22), our interests were similar to those of the ecologist: cell births, deaths, habitats, territorial limitations, and the maintenance of population sizes. The one ecological topic conspicuously absent was that of natural selection: we said nothing of co...