This condition is caused by a genetic defect found in the X chromosome, and therefore, you can conclude your answer from this info.
Due to brainly not accepting my essay, I have instead included a image of it. :D
Answer:
black is the dominant phenotype.
Explanation:
The black gene "overrides" the gene that codes for blue, thus making it dominant.
It could have the most direct effect on the amount of mitochondria in cells and also the system of the membrane.
The lining of the heart is the pericardium.