The correct answer is color vision.
The macula lutea is an area near the center of the human's eye retina. It has an oval shape and is responsible for the high-resolution color vision we have under good light conditions. If the macula lutea is destroyed, due to macular degeneration or a retinal detachment, then this color vision is impaired.
A genotype is the genetic coding of a trait, so it's a paired combination of genes. A genotype has two alleles, which can be dominate or recessive, but overall the answer should be <span>a paired combination of genes</span>
It has two layers.
Hope I could help :)
You would use a Physical Model
