Evolution Exam 1 – Theisen – Study Guide & Revision Notes
What evolution is NOT - correct answer ✔✔-A belief
-an assumption or speculation
-
What evolution is - correct answer ✔✔-A scientific theory: backed by facts and experiments
-
Darwin observed these 4 features in almost every organism - correct answer ✔✔1) Members of
a species are not identical-phenotypic variation
2) Individuals resemble their parents-heredity
3) In many cases, more individuals are produced than reproduce—often many more: they either
don't survive long enough or they don't reproduce for some reason
4) Reproductive success is often not random-some phenotypes support reproduction better
than others
reproductive success is not always random... - correct answer ✔✔some phenotypes support
reproductive success more than others. If the phenotype is heritable, it will be more common in
future generations
Evolution changes the makeup of.... - correct answer ✔✔a population-individuals do not evolve
What exactly is evolution? - correct answer ✔✔Variation within a population
Environmental feature that favors (or disfavors) one or more variants over the others-selection
(artificial or natural) or a completely random advantage—genetic drift
Increased probability of one variant being successful vs the other variant
Increased number of one type of variant vs the others in the next generation
, Descent with modification-to the variation within the population
Microevolution - correct answer ✔✔characteristics of species change over time
Example—selective breeding
-a type of artificial selection
All dog breeds are subspecies of the grey wolf
Speciation - correct answer ✔✔-number of species changes over time
-one species diverges and becomes two
Two populations diverge to the point that they can no longer interbreed
Macroevolution - correct answer ✔✔-new life forms evolve from earlier forms
-new species replace ancestors
-ancestors go extinct
involves the extinction of a former species as a new species takes its place
Example-The "fossil" record
preserved forms of organisms no longer present
All species... - correct answer ✔✔are related
earth and life are very old... - correct answer ✔✔descent with modification has been happening
for a very long time
transitional forms - correct answer ✔✔-permit connection between related species
-some are fossil, some are extant
What evolution is NOT - correct answer ✔✔-A belief
-an assumption or speculation
-
What evolution is - correct answer ✔✔-A scientific theory: backed by facts and experiments
-
Darwin observed these 4 features in almost every organism - correct answer ✔✔1) Members of
a species are not identical-phenotypic variation
2) Individuals resemble their parents-heredity
3) In many cases, more individuals are produced than reproduce—often many more: they either
don't survive long enough or they don't reproduce for some reason
4) Reproductive success is often not random-some phenotypes support reproduction better
than others
reproductive success is not always random... - correct answer ✔✔some phenotypes support
reproductive success more than others. If the phenotype is heritable, it will be more common in
future generations
Evolution changes the makeup of.... - correct answer ✔✔a population-individuals do not evolve
What exactly is evolution? - correct answer ✔✔Variation within a population
Environmental feature that favors (or disfavors) one or more variants over the others-selection
(artificial or natural) or a completely random advantage—genetic drift
Increased probability of one variant being successful vs the other variant
Increased number of one type of variant vs the others in the next generation
, Descent with modification-to the variation within the population
Microevolution - correct answer ✔✔characteristics of species change over time
Example—selective breeding
-a type of artificial selection
All dog breeds are subspecies of the grey wolf
Speciation - correct answer ✔✔-number of species changes over time
-one species diverges and becomes two
Two populations diverge to the point that they can no longer interbreed
Macroevolution - correct answer ✔✔-new life forms evolve from earlier forms
-new species replace ancestors
-ancestors go extinct
involves the extinction of a former species as a new species takes its place
Example-The "fossil" record
preserved forms of organisms no longer present
All species... - correct answer ✔✔are related
earth and life are very old... - correct answer ✔✔descent with modification has been happening
for a very long time
transitional forms - correct answer ✔✔-permit connection between related species
-some are fossil, some are extant
