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Organism whose genome contains a gene for a certain trait or disease that is not expressed in the organism's phenotype

Sex-linked gene

Gene that is located on a sex chromosome

X-chromosome activation

Process that occurs in female mammals in which one of the X chromosomes is randomly turned off in each cell

Incomplete dominance

Heterozygous phenotype that is a blend of the two homozygous phenotypes


Heterozygous genotype that equally expresses the traits from both alleles

Polygenic trait

Trait that is produced by two or more genes

Linkage map

Diagram that shows the relative locations of genes on a chromosome


Chart of the phenotypes and genotypes in a family that is used to determine whether an individual is a carrier of a recessive allele


Image of all of the chromosomes in a cell

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