Medical Genetics Since one is not following a single locus with dominance or recessivity but is following several loci that act in concert, counseling for multifactorial inheritance diseases requires a different approach from that taken for mendelian inheritance diseasesMedical Genetics Since one is not following a single locus with dominance or recessivity but is following several loci that act in concert, counseling for multifactorial inheritance diseases requires a different approach from that taken for Mendelian inheritance diseases