click below
click below
Normal Size Small Size show me how
Chapter 6.3-6.6
Mendel and Probablility
| Term | Definition |
|---|---|
| trait | distinguishing characteristics that are inherited |
| genetics | study of biological inheritance patterns |
| purebred | genetically uniform |
| cross | mating of two organisms |
| law of segregation | - organisms inherit two copies of each gene - organisms donate one gene copy to gametes |
| genome | all of an organism's genetic makeup |
| gene | piece of DNA that provides a set of instructions for cells to release a certain protein |
| genotype | genetic makeup of a specific set of genes |
| allele | any alternative form of a gene that may occur at a certain locus |
| dominant | allele always expresses |
| homozygous | two of the same allele at a specific locus |
| recessive | allele only expressed when two copies are present |
| heterozygous | two different alleles at a specific locus |
| monohybrid cross | examine inheritance of one specific trait |
| testcross | cross between an organism with an unknown genotype and an organism with the recessive phenotype. |
| law of independent assortment | states that allele pairs separate independently of each other during gamete formation, or meiosis |
| phenotype | physical characteristics |
| crossing over | exchange of chromosome segments between homologous chromosomes during prophase I of meiosis I. |
| genetic linkage | genes located together that are inherited together |
| Punnett square | grid system that predicts all possible genotypes of a cross |
| dihybrid cross | examine inheritance of two different traits |
| probability | likelihood a particular event will happen |