In order for a population to remain in Hardy-Weinberg equilibrium, mating must be random. What would happen to the genotypic and phenotypic frequencies if individuals were more likely to mate with others that shared their phenotype? [2 pt] Homozygous dominant genotypes and the dominant phenotype would gradually become more frequent. Homozygous recessive genotypes and the recessive phenotype would gradually become more frequent. Heterozygous genotypes and the dominant phenotype would gradually become more frequent. Heterozygous genotypes and the recessive phenotype would gradually become more frequent.

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).