All of the alleles of all the genes in a population represent the population's?

All of the alleles of all the genes in a population represent the population's?
gene pool.
Hardy-Weinberg equilibrium.
genotype.
gene flow.
genome.

The usage of the insecticide DDT to control mosquitos resulted in
stabilizing selection to insecticide resistance in the insects.
directional selection to insecticide resistance in the insects.
disruptive selection to insecticide resistance in the insects.
no change in the insect population.
genetic drift to insecticide resistance in the insects.

Microevolution is not generated by which of the following?
random mating
genetic drift
gene flow
mutation
natural selection

British land snails primarily occur in two extreme phenotypes. This is an example of
directional selection.
mutation.
disruptive selection.
genetic drift.
stabilizing selection.

Which of the following does not generate genetic variation within a population?
geographic isolation
independent assortment of alleles
mutations
sexual reproduction
crossing over

A reproductive barrier that prevents interbreeding because the two species mate during different times of the year is called a
behavioral isolation.
F2 fitness isolation.
hybrid sterility isolation.
temporal isolation.
postzygotic isolating mechanism.

Geographic isolation is not a factor in sympatric speciation.
True/False?

A major difference between allopatric and sympatric speciation is whether?
two or three species result.
resulting species are reproductively isolated or not.
gene flow continues to occur or not.
the new species are separated by a prezygotic or postzygotic isolating mechanism.
geographic isolation is required or not

Thank you for the help