Natural Science Exam 3 UPDATED
ACTUAL Questions and CORRECT
Answers
Evolution - CORRECT ANSWER - A change in the genetic makeup of a population over
time
Theory of Common Descent - CORRECT ANSWER - all life shares a common ancestor
smallest unit of life that can evolve - CORRECT ANSWER - populations
Population - CORRECT ANSWER - group of individuals of the same species that live in
the same area
Mutation - CORRECT ANSWER - a random change in allele frequency
Genetic drift - CORRECT ANSWER - A change in the allele frequency of a population as
a result of chance events rather than natural selection.
Bottleneck effect - CORRECT ANSWER - a sudden decrease in population size due to
disaster that changes allele frequency
Founder effect - CORRECT ANSWER - change in allele frequencies as a result of the
migration of a small subgroup of a population
Migration/Gene Flow - CORRECT ANSWER - movement of genes between populations
, Natural Selection - CORRECT ANSWER - A process in which individuals that have
certain inherited traits tend to survive and reproduce at higher rates than other individuals
because of those traits.
3 conditions for evolution by natural selection - CORRECT ANSWER - 1. traits must vary
within population
2. trait must be heritable
3. differential reproductive success must occur
Fitness - CORRECT ANSWER - how well an organism can survive and reproduce in its
environment
Adaptation - CORRECT ANSWER - A trait that helps an organism survive and reproduce
Directional Selection - CORRECT ANSWER - occurs when natural selection favors one
of the extreme variations of a trait
Stabilizing Selection - CORRECT ANSWER - natural selection that favors intermediate
variants by acting against extreme phenotypes
Disruptive Selection - CORRECT ANSWER - natural selection that favors the two
extreme phenotypes
Antibiotic resistance - CORRECT ANSWER - the evolution of populations of pathogenic
bacteria that antibiotics are unable to kill
Antibiotic resistance is an example of... - CORRECT ANSWER - directional selection
Microevolution - CORRECT ANSWER - small-scale changes in allele frequencies in a
population
ACTUAL Questions and CORRECT
Answers
Evolution - CORRECT ANSWER - A change in the genetic makeup of a population over
time
Theory of Common Descent - CORRECT ANSWER - all life shares a common ancestor
smallest unit of life that can evolve - CORRECT ANSWER - populations
Population - CORRECT ANSWER - group of individuals of the same species that live in
the same area
Mutation - CORRECT ANSWER - a random change in allele frequency
Genetic drift - CORRECT ANSWER - A change in the allele frequency of a population as
a result of chance events rather than natural selection.
Bottleneck effect - CORRECT ANSWER - a sudden decrease in population size due to
disaster that changes allele frequency
Founder effect - CORRECT ANSWER - change in allele frequencies as a result of the
migration of a small subgroup of a population
Migration/Gene Flow - CORRECT ANSWER - movement of genes between populations
, Natural Selection - CORRECT ANSWER - A process in which individuals that have
certain inherited traits tend to survive and reproduce at higher rates than other individuals
because of those traits.
3 conditions for evolution by natural selection - CORRECT ANSWER - 1. traits must vary
within population
2. trait must be heritable
3. differential reproductive success must occur
Fitness - CORRECT ANSWER - how well an organism can survive and reproduce in its
environment
Adaptation - CORRECT ANSWER - A trait that helps an organism survive and reproduce
Directional Selection - CORRECT ANSWER - occurs when natural selection favors one
of the extreme variations of a trait
Stabilizing Selection - CORRECT ANSWER - natural selection that favors intermediate
variants by acting against extreme phenotypes
Disruptive Selection - CORRECT ANSWER - natural selection that favors the two
extreme phenotypes
Antibiotic resistance - CORRECT ANSWER - the evolution of populations of pathogenic
bacteria that antibiotics are unable to kill
Antibiotic resistance is an example of... - CORRECT ANSWER - directional selection
Microevolution - CORRECT ANSWER - small-scale changes in allele frequencies in a
population
