genetic locus in the conventional sense, i.e., either a single gene or closely linked block of functionally related genes.

In modern sense, the inheritance mode of polygenic patterns is called polygenic inheritance, whose main properties may be summarized as follows:
#Most metric and meristic traits are controlled by a number of genetic loci.
#Main mode of nonallelic genes interaction in corresponding gene series is addition of mainly small particular allele contributions.
#The