List five mechanisms by which gene frequencies in a population can be altered. Describe each briefly

What will be an ideal response?


Gene frequencies can be altered by mutation, which changes allele frequencies or creates new alleles; gene flow, which introduces new alleles into a population; genetic drift, which changes allele frequencies due to random events; natural selection, in which traits that confer a reproductive advantage grow more common in a population; and sexual selection, which produces differential reproductive success.

Biology & Microbiology

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Of the 23 pairs of human chromosomes, 22 pairs are homologous and are found in both males and females. These are called ________.  

A.  bivalents B.  autosomes C.  recombinant chromosomes D.  somatic chromosomes

Biology & Microbiology

The resting membrane potential is closest to the equilibrium potential for ________ ions

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

The principal purpose of Arcata, California's, marsh and wildlife sanctuary is to

A. re-establish populations of rare cranes. B. provide an educational resource for school students. C. filter the city's sewage. D. store drinking water for urban use. E. provide open park space for the city's community.

Biology & Microbiology

Bactericidal drugs tend to target bacterial

A) cell walls, cell membranes, and nucleic acids. B) protein synthesis and nucleic acids. C) nucleic acids. D) cell walls and cell membranes. E) cell walls and enzyme activation.

Biology & Microbiology