(repulsion) The situation in which an individual is heterozygous for two linked * genes (either two units of function or two mutations in the same functional unit), and the recessive (or mutant) allele of one gene is on the same chromosome as the dominant (or normal) allele of the other gene. The homologous chromosome will thus possess the dominant allele of the first gene and the recessive allele of the second gene. If the recessive alleles are in the same functional unit then their effects will show in the phenotype because there is no unchanged functional unit to mask them. If they are in different functional units, then the phenotype will be normal. This is the basis of the * cis-trans test. Compare cis arrangement. |
