Biology (11th Edition)

Published by McGraw-Hill Education
ISBN 10: 1-25918-813-2
ISBN 13: 978-1-25918-813-8

Chapter 13 - Chromosomes, Mapping, and the Meiosis-Inheritance Connection - 13.4 Genetic Mapping - Inquiry Question: 1

Answer

Mendel would not have seen the simple ratios which occur for genes showing both segregation and independent assortment. Specifically, these two genes being found close together means that independent assortment would not have been seen in dihybrid crosses involving these two genes.

Work Step by Step

Consider what is unusual about these two genes: they are physically linked on the same chromosome. That means that they cannot independently assort, leading to whatever alleles are on the same physical copy of that chromosome staying together most of the time (when crossing over does not occur between them). This, in turn, leads to altered ratios of phenotypes.
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