title: Haemonchus contortus: genetically determined polymorphism in females.
mesh_terms: D000483:Alleles; D000818:Animals; D002417:Cattle; D003433:Crosses, Genetic; D005260:Female; D005808:Genes, Recessive; D014644:Genetic Variation; D006041:Goats; D006720:Homozygote; D008297:Male; D010641:Phenotype; D011110:Polymorphism, Genetic; D012756:Sheep; D014251:Trichostrongyloidea / Q000145:classification / Q000302:isolation & purification