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Single Allele

traits that are controlled by a single dominant allele or homozygous

Single Allele

EX. height in pea plant is controlled by a dominant tall allele or two recessive short alleles

Multiple Alleles

traits controlled by more than 2 allels from the same gene

Multiple Alleles

EX. there are three allels for blood type which result in four blood types

Incomplete Dominance

traits have a heterozygous genotype that is intermediate between the dominant and recessive allele

Incomplete Dominance

EX. Some varities of flowering plants will produce a pink flowering version when a homozygous white are crossed


traits which have a heterozygous genotype where both alleles have equal expression


EX. a chicken that is homozygous black is crossed with a chicken that is homozygous white. Each offspring is black and white


traits that appear on the 23rd pair of chromosomes & are normally tfound on the "X" chromosome


Colorblindness and hemophilia


traits controlled by 2 or more genes


EX. skin color is controlled by 4-7 genes

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