Biology 2010 Student Edition

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

Chapter 11, Introduction to Genetics - Assessment - 11.1 The Work of Gregor Mendel - Understand Key Concepts/Think Critically - Page 332: 6


The parent plants could be either $Tt$ x $Tt$ or $Tt$ x $tt$. The homozygous dominant genotype, $TT$, could not be present in the parent organisms.

Work Step by Step

If we have both heterozygous parents $Tt$ and $Tt$, then the offspring could have genotypes $TT$, $Tt$, and $tt$. This means that the offspring could be tall or short plants. If one parent is heterozygous $Tt$ and the other is homozygous recessive $tt$, then the offspring can have genotypes $Tt$ and $tt$, so the offspring could be tall or short plants. Neither of the parents can be homozygous dominant $TT$ because the offspring would all inherit the dominant allele $T$, so all the offspring would have to be tall, regardless of what the other parent's genotype is.
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