A synapse is _______________. a gene that controls the nervous system.a neurotransmitter molecule.

• a receptor on a cell that binds a neurotransmitter.
• a type of protein.
• a space between neurons.

Hardy-Weinberg equilibrium is possible only if the population is

• small, with nonrandom mating and no migration, no mutation, and no natural selection.
• large, with random mating and no migration, no mutation, and no natural selection.
• large, with nonrandom mating, mutation, genetic drift, and natural selection.
• small, with no migration out or in, and dominant alleles outnumbering recessive alleles.
• comprised of very young and fertile individuals and no newcomers arrive

During interaction between genes and environment, the phenotype ____________.

• changes the genotype
• is expressed as discontinuous variation
• is stable once it has been expressed in the organism
• can be quantitatively subdivided into genotypic and environmental components
• is variable and undergoes continuous change throughout the life of the organism

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