If the gens for the mendelian characters are carried by the chromosomes we should expect to find demonstrated in Drosophila that there are as many groups of characters that are inherited together as there are pairs of chromosomes, provided the chromosomes retain their individuality.
"Sex-linked Inheritance in Drosophila"
Thomas Hunt Morgan Calvin B. Bridges
Much evidence has been adduced to prove that such inheritance occurs in accordance with mendelian laws, but the subject is so complicated that more comprehensive studies must be made before we may consider the matter as settled.
"Eugenics as a Factor in the Prevention of Mental Disease"
Horatio Milo Pollock
mendelian laws may apply.
"The Glands Regulating Personality"
Louis Berman, M.D.