The question above is related to the family's genotypes shown in the image below.
Answer:
The pattern that explains the existence of polygens being called "additives" is the pattern of dominant and recessive genes incorporated in the same system.
Step-by-step explanation:
Human skin color is determined by polygenic inheritance, as skin color is determined by two pairs of alleles, rather than just a pair of alleles, like most phenotypic characteristics. In this type of inheritance, it is common to use the term "polygenes" to determine the gene that is a gene that controls a phenotypic characteristic along with many other genes.
When "polygenes" are called "additives" it means that this set of genes are establishing a pattern of dominance and recessivity simultaneously in the same phenotypic characteristic, and may present extreme phenotypic differences, as in the case of the family shown below.