It is because when alleles show a co-dominant relationship , neither allele is dominant and both are expressed in the phenotype of the heterozygote. The human ABO blood groups provide a good example of codominace. The ABO system is due to a gene that codes for molecules on the surface of red blood cells
Outer planets have dozens of moons each
Ecosystems can be large and are made of biomes. Some examples of ecosystems are deserts and forests.
