Biology: The Unity and Diversity of Life (14th Edition)

Published by Brooks/Cole Publishing Co.
ISBN 10: 1305073959
ISBN 13: 978-1-30507-395-1

Chapter 13 - Self-Quiz - Page 214: 7


b. genotype

Work Step by Step

In a testcross, an individual who displays a dominant phenotype but whose genotype is not known is crossed with a known homozygous recessive individual. This can determine whether or not the individual whose genotype is unknown is homozygous dominant or heterozygous. If all of the offspring end up displaying the dominant trait, we know that the individual being tested is homozygous dominant; on the other hand, if some of the offspring display the recessive trait, then the individual who is tested is heterozygous.
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