Phenotypes for which the variation observed in the population of interest is entirely explained by a single "mendelian" factor
Examples:
The seven phenotypes utilized by Mendel (1 )
The Polled / Horned phenotype in cattle
Coat color variation
…
Blood
Groups
Biochemical
Polymorphisms
RFLPs
Minisatellites or VNTR
Markers
Microsatellites or SSR
Markers
SNPs
QTL Mapping in Outbred Half-Sib Pedigrees