click below
click below
Normal Size Small Size show me how
Chapter 9
Section 2: Genetic Crosses
Term | Definition |
---|---|
Genotype | An organism's genetic makeup |
Phenotype | An organism's appearance |
Homozygous | When both alleles of a pair are alike |
Heterozygous | When the two alleles in a pair are different |
Probability | The likelihood that a specific event will occur |
Monohybrid Cross | A cross in which only one characteristic is tracked |
Punnett Square | A graphic used to predict the results of a genetic cross |
Genotypic Ratio | The ratio o the genotypes that appear in offspring |
Phenotypic Ratio | The ratio of an offspring's phenotypes |
Testcross | An individual of unknown genotype is crossed with a homozygous recessive individual |
Complete Dominance | One allele is completely dominant over another |
Incomplete Dominance | The F1 offspring will have a phenotype inbetween that of the parents |
Codominance | Occurs when both alleles for a gene are expressed in a heterozygous offspring |
Dilhybrid Cross | A cross in which two characteristics are tracked |