The lack of oxygen, poor/ bad bacteria smear, or difference in temperature that prevents optimal growth, within media.
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
the temperature of mercury is not regulated and the atmosphere easily floats away while being replaced with solar wind .
Mercury has a thin atmosphere.
Homozygous<span>. An organism that has two identical alleles for a trait.</span>
