In rabbits, brown (b) fur is dominant to white (b) fur. If a rabbit with the genotype bb is crossed with a rabbit with a genotype bb, what percentage of the offspring are expected to have brown fur?.

he is very short, and he can only reach halfway up on the elevator buttons. but on a rainy day, he has his umbrella with him, and he uses it to poke the button at the top.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

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