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Ch. 3, Section 2

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probability
A number that describes how likely it is that an event will occur.
Punnett square
A chart that shows all the possible combinations of alleles that can result from a genetic cross.
phenotype
An organism's physical appearance, or visible traits.
genotype
An organism's genetic makeup, or allele combinations.
homozygous
Having two identical alleles for a trait.
heterozygous
Having two different alleles for a trait.
codominance
A condition in which neither of two alleles of a genen is dominant or recessive.