The manager of a pet shop realizes that white and grey mice have better sales over black mice. If mice only have two alleles
black (B) and white (W) that exhibit incomplete dominance,
what should the genotypes for the parent mice be to produce
both white and grey mice but no black mice?

answer: c

explanation:

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

c.           is the correct answer