Genetic carrier
= Genetic carrier
A genetic <genetic carrier> has one disease-associated recessive <allele> and one normal <allele> at a <genetic locus>, and is unaffected under a fully penetrant recessive model. Two <genetic carriers> have affected-offspring <probability> $1/4$ under <Mendelian segregation>; a <genetic carrier> and an individual with no disease <allele> have affected-offspring <probability> zero under that same mutation-free model.