Concepts of Genetics (11th Edition)
Language: English
Pages: 896
ISBN: 0321948912
Format: PDF / Kindle (mobi) / ePub
Concepts of Genetics, Eleventh Edition emphasizes the fundamental ideas of genetics, while exploring modern techniques and applications of genetic analysis. The best-selling text has a strong problem-solving approach, and this edition has been extensively updated with relevant, cutting-edge coverage of emerging topics in genetics.
Note: You are purchasing a standalone product; MasteringGenetics™does not come packaged with this content. If you would like to purchase both the physical text and MasteringGenetics search for ISBN-10: 0321948475/ISBN-13: 9780321948472. That package includes ISBN-10: 0321948912/ISBN-13: 9780321948915 and ISBN-10: 0133863298/ISBN-13: 9780133863291. MasteringGenetics is not a self-paced technology and should only be purchased when required by an instructor.
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Reduction. To quantify the disparities that result from interference, we calculate the coefficient of coincidence (C): Observed DCO C = Expected DCO In the maize cross, we have 0.078 C = = 0.804 0.097 Once we have found C, we can quantify interference (I) by using this simple equation I = 1 - C In the maize cross, we have I = 1.000 - 0.804 = 0.196 If interference is complete and no double crossovers occur, then I = 1.0. If fewer DCOs than expected occur, I is a positive number and positive.
Individual cells within populations. These processes provide geneticists with the basis for chromosome mapping. The study of bacteria and bacteriophages has been essential to the accumulation of knowledge in many areas of genetic study. For example, much of what we know about the expression and regulation of genetic information was initially derived from experimental work with them. Furthermore, as we shall see (Chapter 20), our extensive knowledge of bacteria and their resident plasmids has.
To cells exhibiting heritable variation, particularly with respect to growth under unique environmental conditions. Prior to 1943, the source of this variation was hotly debated. The majority of bacteriologists believed that environmental factors induced changes in certain bacteria, leading to their survival or adaptation to the new conditions. For example, strains of E. coli are known to be sensitive to infection by the bacteriophage T1. Infection by the bacteriophage T1 leads to reproduction of.
Plants thousands of years ago by artificial selection of genetic variants within populations. Between 8000 and 1000 B.C. horses, camels, oxen, and various breeds of dogs (derived from the wolf family) had been domesticated, and selective breeding soon followed. Cultivation of many plants, including maize, wheat, rice, and the date palm, began around 5000 B.C. Remains of maize dating to this period have been recovered in caves in the Tehuacan Valley of Mexico. Such evidence documents our ancestors’.
Or lethal. For example, if bacterial viruses are cultured under permissive conditions of 25°C, the mutant gene product is functional, infection proceeds normally, and new viruses are produced and can be studied. However, if bacterial viruses carrying temperature-sensitive mutations infect bacteria cultured at 42°C—the restrictive condition—infection progresses up to the point where the essential gene product is required (e.g., for viral assembly) and then arrests. Temperature-sensitive mutations.