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Read e-book online Cats are not Peas: A Calico History of Genetics PDF

By Laura L. Gould

ISBN-10: 1468463136

ISBN-13: 9781468463132

ISBN-10: 1468463152

ISBN-13: 9781468463156

After she by accident followed a calico cat that became out to be a male, Laura Gould used to be seized via interest. For there to be no male calicos in any respect will be comprehensible - it used to be their severe rarity that was once the puzzle. Gould, knowledgeable in linguistics with out earlier education in genetics, made up our minds to profit how this is able to be. Her researches took her throughout the nice discoveries in genetics, from Mendel's experiences of inheritance in peas in the course of the discovery of the chromosome and the position of DNA - all noticeable from the little-known and unheralded standpoint of the pivotal position performed via cats as experimental matters during this epic drama. Narrated with inimitable grace and wit, this is often the tale of an unrecognized bankruptcy within the background of science.

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Additional info for Cats are not Peas: A Calico History of Genetics

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By means of these two divisions, four sperm cells are produced, each with the requisite single set of 19 chromosomes on board, ready for action. Those who wish to understand the process of meiosis in all its gory detail should look carefully at Figure 5. Those who don't will be relieved to learn that only a general understanding of this reduction division is necessary in order to comprehend what follows. Although the general mechanisms described here apply equally well to eggs and sperm, these two types of sex cells have quite different characteristics.

It seems that this development had to wait for the demise of the dinosaurs, which happened about twenty million years before that. Mammals had already 44 Cats Are Not Peas been in existence for well over a hundred million years by the time the largest of the dinosaurs died off, but all that time they had remained quite small - about the size of martens or weasels. They had no chance to become large and dominant, as they are now, with all those dinosaurs around. The cat family, known as the Felidae, evolved from some early mammalian carnivores called Miacids, which had already developed the intricate mechanism of retractable claws.

How Do You Get a George? 39 The mad librarian All the information about why there aren't any male calicos to speak of, how you get more calicos under such circumstances, and how the occasional Georges occur had been gleaned fairly easily, using only The Book oj the Cat and Human Genetics for reference. But the remaining ques- Lions seemed harder, and there were more of them all the time - the search was getting serious. Armed with my alumna card. I drove the considerable distance to my alma mater, hoping to find in its extensive biology library some articles about XXY people.

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Cats are not Peas: A Calico History of Genetics by Laura L. Gould


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