Jim Endersby introduces the reader to 12 different organisms in this fascinating book: Equus quagga, Passiflora gracilis, Homo sapiens, Hieracium auricula, Oenothera lamarckiana, Drosophila melanogaster, Cavia porcellus, Bacteriophage, Zea mays, Arabidopsis thaliana, Danio rerio and OncoMouse®.* Some of these characters may be familiar to you, some not, but Endersby uses each of them to introduce the reader to scientists seeking to understand the secret of life.
Consider Equus quagga:
"The right honourable George Douglas, FRS, 16th Earl of Morton, was perplexed; in 1820, he had sold a chestnut-brown mare to his friend, Sir Gore Ouseley, who had crossed her with 'a very fine black Arabian horse'. Both Morton and Ouseley were astonished by the offspring of this union, two foals who were clearly Arabian horses, but 'both in their colour, and in the hair of their manes, they have a striking resemblance to the quagga'.
"Quaggas were a kind of zebra, but it was mainly their heads and shoulders that were striped. They belong to a small, sad club (whose members include the passenger pigeon and the thylacine, or Tasmanian tiger) of animals for whom we know the exact day on which they became extinct. The last quagga died in Amsterdam zoo on 12 August 1883. At the time, the species went unmourned, as no one realized she was the last one. Why should the offspring of Ouseley's animals look like quaggas, when both parents were horses?"
Morton had a theory. Darwin considered the answer significant for his theory of evolution.
Endersby writes: "This book is about how some of these mysteries were unravelled. Long before Darwin, most people knew that for most organisms, as for humans, both males and females were needed to produce offspring, but even after centuries of investigation and speculation, no one knew exactly why, nor exactly what each contributed to their progeny. Given that some creatures managed without sex, what was its purpose? And what about inheritance? Why do most children look like their parents, while some are more like one of their grandparents? How are the characteristics of animal or plant breeds passed on and preserved over generations? And, given that creatures only ever give birth to creatures of the same species, where do new types of organisms come from? Given that species remain largely constant over generations, how and why do they sometimes vary?"
Endersby describes how scientists with the aid of these 12 subjects found some of the answers.
Scientists began studying guinea pigs around 1780 and they shed light on scurvy, vaccines and vitamins, and shed light on inbreeding.
In 1845 Robert Peel abolished the tax on glass, James Hartley invented a system for making rolled plate glass, large greenhouses prolifiated in England, including Darwin's where he studied the crinkled passionflower. The plant gave Darwin clues to his theory, and the reader enjoys Endersby's meandering that describes how it all came about.
Cheap glass led to a craze for aquaria. Tropical fish were in great demand; in 1905 zebra fish were imported; in the American scientists found their value in research: in less than half an hour, each female fish can produce several hundred eggs, all of them transparent and easy to study under a microscope. The eggs develop into recognisable fish in a couple of days. Endersby tells the tale in compelling fashion.
The fruit fly found its way to labs in the US from the Caribbean; Endersby describes how it accompanied bananas imported from the Far East in the 16th century as cheap food for slaves.
Chemical analysis of the virus bacteriophages showed it consisted of DNA surrounded by a coating of protein. By 1953 it was clear genes were made of DNA, and James Watson and Francis Crick established that DNA had the structure of a double helix. That opened the door to modern genetics.
OncoMouse® is the star of the last chapter, the first patented, transgenic animal. Researchers at Harvard University designed and produced this organism to carry a type of gene that increases the mouse's susceptibility to cancer.
Endersby has a light, sure way of telling these complex, fascinating stories, all told from the unusual perspective of the subjects of the research.
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* These characters are carefully described in the book, of course, and Endersby maintains an excellent website providing much more information. Google: jim endersby .
Robert C. Ross 2008 |