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9780099237426: 'CRICK, WATSON AND DNA (BIG IDEA)'

At a moment of great discovery, one Big Idea can change the world...The discovery by Francis Crick and James Watson of DNA- the very building blocks of life - has astounding implications for mankind's future.Not only in the scientific possibilities of cloning, life expectancy and medical research, but also in our everyday lives - such as forensics and the genetic engineering of food.But with this discovery have come important ethical questions...Crick, Watson & DNA is an engaging and accessible examination of these two scientists' lives, radical work and legacy.Theirs was a frantic race against other scientists to understand the structure of DNA.Their Big Idea extends even beyond their monumental achievement to the moral implications that have arisen from it.The Big Idea series is a fascinating look at the greatest advances in our scientific history, and at the men and women who made these fundamental breakthroughs.

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Paul Strathern (Curie and Radioactivity, Hawking and Black Holes) argues that the advances of molecular biology in the last half of the 20th century are comparable to the gains of nuclear physics in the first: both sciences have given us vast power over our world, and both have challenged our morality with dangerous choices. Strathern also quickly points out that, not coincidentally, both fields arose from the work of ambitious, sometimes foolish, all-too-human researchers.

This 128-page installment in Strathern's The Big Idea series details the work of two brazen wags who were central to the birth of molecular biology: Francis Crick and James Watson. Calling them a "pair of comedians," Strathern describes the tandem research style of the loud and cocksure Crick and the unassuming, gangly Watson. Like an action-flick cop team, the likable pair almost bumbled their way to discovering DNA's zippered helix pattern, with the brilliant, beer-swilling Crick getting called to task by his superiors as Watson quietly pursued hit-and-miss models to crack the code.

One of the better books in The Big Idea series, Crick, Watson, and DNA even includes a decent primer on genetics. In just an hour or so, you'll have a good grasp of the field and more than a few chuckles at the antics of two of its greats. --Paul Hughes

Excerpt. Reprinted by permission. All rights reserved.:

On the Way to DNA: A History of Genetics

UNTIL LITTLE OVER a century ago, genetics was mostly old wives' tales. People saw what happened, but had no idea how or why it happened.

References to genetics go back as far as biblical times. According to Genesis, Jacob had a method for making sure that his sheep and goats gave birth to spotted and speckled offspring. He did this by making them breed in front of sticks with strips of peeled bark which had a similar mottled effect.

More realistically, the Babylonians understood that for a date palm to be fruitful, pollen from the male palm had to be introduced to the pistils of the female palm.

The ancient Greek philosophers were the first to look at the world in a recognizably scientific fashion. As a result they produced theories about almost everything, and genetics was no exception. Aristotle's observations led him to conclude that the male and female do not make equal contributions to their offspring. Their contributions are qualitatively different: the female gives "matter," the male gives "motion."

A prevalent belief in ancient times held that if a female had previously mated and had progeny, the characteristics of their father would appear in the woman's subsequent progeny by any other male. This fairy story was even dignified with a pseudo-scientific name by the ancient Greeks, who called it telegony (meaning "distant-begetting").

A more interesting theory was pangenesis, which held that each organ and substance of the body secreted its own particles, which then combined to form the embryo.

Such beliefs recur in genetic theory through the centuries, in a manner curiously similar to the actual recurrence of genetic traits. (Pangenesis was to pop up for well over 2000 years, and was even accepted by Darwin.)

Biology, and with it genetics, crossed the threshold into science in the seventeenth century. This was almost entirely due to the microscope, which was invented by the Dutch lens-grinder and counterfeiter Zacharias Jansen in the early 1600s. Microscopes led to the discovery of the cell. (This term was first used by the British physicist Robert Hooke, but was in fact misapplied to the tiny spaces left by dead cells, which reminded him of prison cells.)

The discovery of sex cells (or germ cells) caused great excitement. Soon overenthusiastic microscopists were convinced that they had observed "homunculi" (tiny human forms) inside the cells, and it looked as if the problem of reproduction was solved. More importantly, the English botanist Nehemiah Grew speculated that plants and animals were "contrivances of the same wisdom." He suggested that plants too have sexual organs and exhibit sexual behavior. When the pioneer Swedish biologist Carl Linnaeus introduced his classification for species of plants and animals, the way was opened for more systematic research. The study of hybrids led to further speculation about the nature of genetic material.

For centuries it had been widely accepted that heredity was transmitted by "blood." (Hence the origin of such commonplace expressions as "blue blood," "blood line," "mixed blood" and so forth.) This was not only loose, but inadequate. How could the same parents produce differing offspring from the same "blood"? Also, what accounted for the appearance of characteristics not present in either parent, but seen in long-dead ancestors and distant relatives? For instance, in thoroughbred racehorse breeding, piebalds have been known to recur after a gap of dozens of generations. (This example reveals one of the great lost opportunities of genetics. All English thoroughbreds are descended from the forty-three "Royal Mares" imported by Charles II, and three Oriental stallions imported a few years earlier. The breeding books trace each bloodline back to its origins, with notes on the characteristics of each progeny. Well over a century before genetics was born, any Newmarket trainer had at his fingertips sufficient material to found this science.)

By the mid-eighteenth century the scientists had at last started speculating along lines that were obvious to any racehorse breeder. The idea of evolution began to circulate. One of the early developers of this idea was the eighteenth-century philosopher-poet-scientist Erasmus Darwin (grandfather of the famous Charles). Erasmus Darwin was convinced that species were capable of change. Any creature with "lust, hunger and a desire for security" would organically adapt to its surroundings. But how?

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Published by ARROW BOOKS LTD (1997)
ISBN 10: 0099237423 ISBN 13: 9780099237426
New Paperback Quantity Available: 1

Book Description ARROW BOOKS LTD, 1997. Paperback. Book Condition: New. Bookseller Inventory # DADAX0099237423

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