Afather has type ab blood, and his wife has type o. what are the chances of the couple having a child with type o blood?
25 percent
75 percent
50 percent
0 percent
a white-flowered rhododendron is crossed with a red-flowered rhododendron. the alleles are codominant. what color flowers will the offspring have?
dark pink all over
light pink all over
white and red spotted
all of the above are correct.

Choose the incorrect statement (a) the motor end plate membrane is only capable of generating graded potentials, but it is contiguous with the skeletal muscle sarcolemma, which can generate action potentials. (b) propagation of an action potential through the t-tubules into the sarcoplasmic reticulum triggers the release of ca++ into the cytoplasm of a skeletal muscle fiber. (c) the generation of suprathreshold endplate potentials in multiple muscle fibers could be due to the increased frequency of action potential generation at the axon hillock of a single motor neuron. (d) a greater amount of ach would be found in the presynaptic vesicles of a motor unit that fired several action potentials after exposure to botulinum toxin, than in a motor unit that fired several action potentials after exposure to the venom of the krait snake (which contains α-bungarotoxin).