diathesis (n.)
- affinity
 - allele
 - allelomorph
 - animus
 - aptitude
 - aptness
 - bent
 - bias
 - birth
 - body-build
 - brand
 - cast
 - character
 - characteristic
 - chromatid
 - chromatin
 - chromosome
 - complexion
 - composition
 - constitution
 - delight
 - determinant
 - determiner
 - dharma
 - disposition
 - eagerness
 - eccentricity
 - endowment
 - ethos
 - eugenics
 - factor
 - fiber
 - frame
 - gene
 - genetics
 - genius
 - grain
 - habit
 - heredity
 - heritage
 - hue
 - humor
 - idiosyncrasy
 - ilk
 - inclination
 - individualism
 - inheritance
 - kidney
 - kind
 - leaning
 - liability
 - liking
 - make
 - makeup
 - mettle
 - mind
 - mind-set
 - mold
 - nature
 - penchant
 - pharmacogenetics
 - physique
 - predilection
 - predisposition
 - preference
 - prejudice
 - probability
 - proclivity
 - proneness
 - propensity
 - property
 - quality
 - readiness
 - replication
 - set
 - slant
 - somatotype
 - sort
 - spirit
 - stamp
 - strain
 - streak
 - stripe
 - susceptibility
 - system
 - temper
 - temperament
 - tendency
 - tenor
 - tone
 - tropism
 - turn
 - twist
 - type
 - vein
 - warp
 - way
 - weakness
 - willingness