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Chapter 12
Section 1: DNA Technology
| Term | Definition |
|---|---|
| Sex Chromosome | Contain genes that determine the sex of an individual |
| Autosome | The remaining chromosomes that are not directly involved in determining the sex of an individual |
| Sex-Linked Trait | A trait that is coded for by an allele on a sex chromosome |
| Linked Gene | Pairs of genes that tend to be inherited together |
| Chromosome Map | Diagram that shows the linear order of genes on a chromosome |
| Map Unit | As a frequency of crossing-over 1 percent |
| Germ-Cell Mutation | Mutation in an organisms gametes |
| Somatic-Cell Mutation | Mutations in an organism's body cells and can therefor affect the organism |
| Lethal Mutation | Cause death, often before birth |
| Deletion | Loss of a piece of chromosome due to breakage |
| Inversion | A chromosome segment breaks off, flips around backward, and reattaches |
| Translocation | A piece of one chromosome breaks off and reattaches to a nonhomologous chromosome |
| Nondisjunction | A chromosome fails to separate from it homologous during meiosis |
| Point Mutation | The substitution, addition, or removal of a single nucleotide, the change often occurs within a single gene or other segment of DNA on a chromosome |
| Substitution | One nucleotide replaces another |
| Frameshift Mutation | Making all amino acids downstream change |
| Insertion Mutation | One or more nucleotides are added to a gene, can result in a frameshift mutation |