In sunflowers, tall plants (T) are dominant over short plants (t). If a tt plant
is crossed with a TT plant, what ratio of plants in the offspring would you
predict?

3:1 ratio!

Explanation:

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the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.