If you are talking about two different traits (lets say skin color, caucasian and African American) combining to make a "middle" color (golden tan), it would have to do with incomplete dominance. The traits appearances are not dominant over each other so neither are fully expressed. Some examples of incomplete dominance are: skin color, hair body (curly, wavy, straight), and height in humans. Another type of blending of traits has to do with co-dominance. Co-dominance is the expression of both dominant traits creating a splochy appearance of both traits. Do not confuse this with freckles which is a different trait on its own.
Genetic
Polygenic inheritance is when a group of gene pairs act together to produce a trait.
Multiple gene inheritance. Sree
polygenic inheritance
The unit of heredity found on a chromosome is called a gene.
It is called sex-linked inheritance. If the sex-linked gene is on the X sex chromosome, it is often called X-linked inheritance.
a gene.
Principle of independent assortment
pedigree
Pedigree
Polygenic inheritance is when a group of gene pairs act together to produce a trait.
Gene.
Linked gene inheritance. In humans, it is called x-linked inheritance; sex-linked inheritance is when the trait is carried on the X chromosome.
Multiple gene inheritance. Sree
Dominant Inheritance is when one parent has a dominant gene and the other has a recessive gene. The dominant gene overpowers the recessive gene, and only the dominant gene is phenotypically expressed.Source: http://www.accessexcellence.org/RC/VL/GG/recessive.phpSome examples are variegate porphyria, Huntington's disease and myotonic dystrophy.source: http://genome.wellcome.ac.uk/doc_WTD020849.html
biological inheritance of genetically recessive alleles (genes)
Gregor Mendel
polygenic inheritance