The ocean near the lake is also home to stickleback fish where seasonal channels allow some movement between the ocean and lake. Scientists compared the ocean sticklebacks and found that 440 of the ocean fish had spines and 64 were spineless. A. The frequency of recessive alleles in this population (q) B. The frequency of dominant alleles in this population (p) C. The percentage of individuals in the population that are heterozygous: D. Provide an explanation for why so many fish in display the recessive trait.

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).