The indoor cabinet also typically includes a furnace (or the inside part of a heat pump). The indoor and outdoor units are connected by a refrigerant line. Greater energy efficiency possibilities - Split air conditioning systems have SEER ratings from 13 to 23.
A single gene trait is controlled by a single gene. Polygenic traits are controlled by two or more than two genes on different chromosomes. These genes are described as polygenes. Examples of human polygenic inheritance are height, skin color and weight.
So multiple alleles are more than two alleles for one trait, and polygenic traits are one trait that is influenced by mulitple genes. This information came from my biology textbook, Biology: Principles and Explorations by Holt, Rinehart, and Winston.ultiple alleles are genes that have more than two alleles. An  example of this would be blood types, with ABO as three separate  alleles.   Polygenic traits are traits â¦ whose phenotype rely on alleles from  different genes.