Review What does incomplete dominance mean and
give an example
Design an Experiment Design an experiment to
determine whether the pink flowers of petunia
plants result from incomplete dominance
Compare and Contrast What is the difference
between incomplete dominance and codominance
CH 11 INTRODUCTION TO GENETICS
11.3 Other Patterns of Inheritance


In most organisms, genetics is more complicated,
because the majority of genes have more than two
alleles
Many important traits are controlled by more than
one gene.
Incomplete Dominance

Heterozygous
phenotype is a blending
or mixing of the
homozygous
phenotypes.
Codominance


Both alleles are visible
Speckled fur/feathers.
Multiple Alleles

Gene with more than
two alleles.
Polygenic Traits



Traits controlled by two or more genes
Wide range of phenotypes
Skin color.
Genes and the Environment


Genes provide a plan for development
Environment plays a role in how the plan unfolds.
Western White Butterfly


Spring hatches have more wing pigments than
summer hatches
To fly the body temperature needs to be 28–40°C.