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Alleles of a gene possessed by an individual

Observable characteristics of an organism

Always expressed in the phenotype if present in the genotype

Expressed in the phenotype if no dominant alleles are present

Neither allele is dominant over the other - both are expressed

inheritance of genes is dependant on the sex chromosome

Any chromosome that isn't a sex chromosome

Genes do not assort independently because they are on the same chromosome

When one gene locus masks or alters the expression of another gene