Suppose your entire herd of cows is polled, what genotype(s) can your bulls have to guarantee that you never have a calf with horns? Is this possible? Hereford cattle can be naturally “polled,” which means they do not have horns. This trait is dominant (P) over cattle with horns (p).

Cells a and b are the same size and shape, but cell a is metabolically quiet and cell b is actively consuming oxygen. oxygen will diffuse more quickly into cell because . b the oxygen molecules inside cell b have a higher kinetic energy b. a its membrane transport proteins will not be saturated c. a the diffusion gradient there is shallowerd. b the diffusion gradient there is steeper