| A | B |
|---|
| carrier | 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 inactivation | process that occurs in female mammals in which one of the X chromosomes is randomly turned off in each cell |
| incomplete dominance | heterozygous genotype that is a blend of the two homozygous phenotypes |
| codominance | heterozygous genotype that equally expresses the traits from both alleles |
| polygenic trait | trait that is produced by two or more genes |
| genetic linkage | tendency for genes located close together on the same chromosome to be inherited together |
| linkage map | diagram that shows the relative locations of genes on a chromosome |
| pedigree | chart of the phenotypes and genotypes in a family that is used to determine whether an individual is a carrier of a recessive allele |
| karyotype | image of all of the chromosomes in a cell |
