Question

BIO EXPERTS!
Human eye color is a polygenic trait. The normal development of eye color requires the coordinated control of these genes. Which statement best describes how this control is coordinated?
a. Genes involved in related functions are arranged into a single operon with a promoter that activates all genes simultaneously.
b. The genes share a specific combination of control elements.
c. The genes are clustered as tandem repeats with a shared promoter region.
d. The genes are splice variants of a single sequence that is activated with a single promoter and then modified post-transcriptionally.

Answer 1

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The statement that best describes how this control is coordinated is 
The genes are splice variants of a single sequence that is activated with a single promoter and then modified post-transcriptionally.

Answer 2

Answer:

The correct answer is option b. "The genes share a specific combination of control elements".

Explanation:

Human eye color is an example of a trait that is controlled under the influence of multiple genes (polygenic). Human eye color is mainly determined by the amount of melanin that is present in the front part of the iris, which it is controlled by up to 16 genes. Among the different genes, the ones that mainly influence eye color are: OCA2 and HERC2. These two genes share a specific combination of control elements, for instance, a regulatory element of HERC2 gene inhibits OCA2 expression as well.