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Vocab 9.2
Genetic Crosses
Term | Definition |
---|---|
Genotype | The entire genetic makeup of an organism; also the combination of genes for one or more specific traits |
Phenotype | An organism's appearance or other detectable characteristic that results from the organism's genotype and the environment |
Homozygous | Describes and individual that has identical alleles for a trait on both homologous chromosomes |
Heterozygous | Describes an individual that has two different alleles for a trait |
Phenotypic Ration | The ration of phenotypes produced by a cross |
Testcross | The crossing of an individual of unknown genotype with a homozygous recessive individual to determine the unknown genotype |
Complete Dominance | A relationship in which one allele is completely dominant over another |
Incomplete Dominance | A condition in which a trait in an individual is intermediate between the phenotype of the individual's two parents because the dominant allele is unable to express itself fully |
Codominance | A condition in which both alleles for a gene are fully expressed |
Dihybrid Cross | A cross between individuals that have different alleles for the same gene |