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Chapter 7
Extending Mendelian Genetics
Term | Definition |
---|---|
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 phenotypes 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 |
linkage map | diagram that shows the relative location s 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 the chromosomes in a cell |