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probability

likelihood that a particular event will occur

Punnett square

diagram showing the gene combinations that might result from a genetic cross

homozygous

term used to refer to an organism that has two identical alleles for a particular trait

heterozygous

term used to refer to an organism that has two different alleles for the same trait

phenotype

physical characteristics of an organism

genotype

genetic makeup of an organism

independent assortment

independent segregation of genes during formation of gametes

incomplete dominance

situation in which one allele is not completely dominant over another

codominance

situations in which both alleles of a gene contribute to the phenotype of the organism

multiple alleles

three or ore alleles of the same gene

polygenic traits

trait controlled by two or more genes

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