By Richard Dawkins
Dawkins's marvelous, artistic method permits us to view the connections among ourselves and all different existence in a bracingly novel manner. It additionally shall we him shed vibrant new mild at the so much compelling features of evolutionary heritage and conception: sexual choice, speciation, convergent evolution, extinction, genetics, plate tectonics, geographical dispersal, and extra. The Ancestor's story is without delay a far-reaching survey of the newest, most sensible considering on biology and a desirable heritage of lifestyles on the earth. the following Dawkins indicates us how impressive we're, how brilliant our heritage, and the way intimate our dating with the remainder of the dwelling world.
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Extra info for The Ancestor's Tale: A Pilgrimage to the Dawn of Evolution
Of course nobody deliberately changes their genes. Science is only now beginning to work out how to do that. As usual, the job was done for us by natural selection, and it happened millennia ago. I don't know exactly by what route natural selection produced adult lactose tolerance. Perhaps adults resorted to baby food in times of desperation, and the individuals that were most tolerant of it survived better. Perhaps some cultures postponed weaning, and selection for survival of children under these conditions spilled over gradually into adult tolerance.
So even tiny amounts of migration are enough to graft the family tree of an otherwise isolated population to that of the mainland. The timing of Rendezvous 0 is likely to depend on the date at which the most isolated pocket of humanity became completely isolated from its neighbour, plus the date at which its neighbour then became completely isolated from its neighbour, and so on. A few island hops may be needed before we can join all the family trees together, but it is then an insignificant number of centuries back until we tumble upon Concestor o.
Muridae is a family, so is Sciuridae. Rodentia is the name of the order to which both belong. Glires is the superorder that unites rodents with rabbits and their kind. There is a hierarchy of such category names, family and order being somewhere in the middle of the hierarchy. Species lies near the bottom of the hierarchy. We work up through genus (plural genera), family, order, class, and phylum (plural phyla), with prefixes like sub- and superofFering scope for interpolation. Species has a particular status, as we shall learn in the course of various tales.