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SECTION
7.2
COMPLEX PATTERNS OF INHERITANCE
Power Notes
Complex Patterns of Inheritance
Incomplete dominance: Heterozygous phenotype is intermediate
between parental phenotypes; Parental phenotypes not seen in F1
generation; Neither allele completely dominant nor completely
recessive
Codominance: Two alleles fully and separately expressed;
Both parental phenotypes seen in all F1 offspring;
Alleles neither dominant nor recessive
Multiple alleles: genes with more than two alleles
Polygenic traits: Traits that result from the interactions of
two or more genes
Epistasis: A gene that overshadows all other genes for a
particular trait
Interaction of environment and genotype: Phenotype is
often the result of interactions between environment and
genotype; temperature and sex of sea turtles;
Identical twins raised separately
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