2points
what happens when alleles for a trait are codominant?

see below

Explanation:

    Codominant traits are both visible.  Since both traits are dominant, one trait can't cover up the other one since neither of them are recessive.  

    For example, roan is a codominant coat color in horses and cattle (and probably other species too).  An offspring with roan coat coloring has both red and white colors visible.  Red and white are both dominant traits, and therefore one trait can't cover the other trait, so both are visible.  

Here's an image that might help:  

(Image Found Online, I do not take any credit for this image.  I'd put the link but it won't let me.  If you need to see the link please let me know.  Plagiarism not intended.  If this post interferes with site policy or something, please feel free to take it down.)

I hope this helps!

osteogenesis imperfecta (oi) refers to a congenital ailment of bones. in the condition, the bones become brittle or fragile. this ailment is a general result of the defect or mutations in the genes (colia1 or colia2). this mutation results in imperfect collagen formation either in quantity or quality wise.  

there are eight kinds of oi defects, and each kind varies with certain distinctions in symptoms. the usual symptoms include frequent bone fractures, loss of hearing in infants, protruding eyes, discoloration of the white in the eyes, respiratory issues, loosening of the joints, short stature, and other symptoms.  

answer; (b) clear with a slight blue tint;