Biology 2010 Student Edition

Published by Prentice Hall
ISBN 10: 9780133669510
ISBN 13: 978-0-13366-951-0

Chapter 11, Introduction to Genetics - Assessment - 11.4 Meiosis - Understand Key Concepts/Think Critically - Page 333: 21



Work Step by Step

In studies conducted on the fruit fly $Drosophila$ $melanogaster$, Alfred Sturtevant found that the farther away two genes were on a chromosome, the more likely they were to cross over; conversely, if two genes are located close to one another, the possibility of them crossing over was small. Using this hypothesis, Sturtevant devised a way of mapping where genes are located on a chromosome based on how often certain genes were found to cross over; his method has been used to make gene maps of other organisms.
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