At a Glance

Life on Earth Chapter 17 How Organisms Evolve
At a Glance

Evolution and the Genetics of Populations: Genes, influenced by the environment, determine the traits of each individual.
The gene pool is the sum of all the genes occurring in a population.
Evolution is the change of gene frequencies within a population.
Mutation and the recombination of alleles during sexual reproduction provide sources of variability.
The equilibrium population is a hypothetical population in which evolution does not occur.

The Mechanisms of Evolution
Mutations are the ultimate source of genetic variability.
Migration produces gene flow between populations.
Small populations are subject to random changes in allele frequencies.
Mating within a population is almost never random.
All genotypes are not equally adaptive.

Natural Selection
Natural selection acts on the phenotype, which reflects the underlying genotype.
Natural selection can influence populations in three major ways.
Natural selection takes several forms.

Extinction
Localized distribution and extreme specialization make species vulnerable in changing environments.
Interactions with other organisms may drive species to extinction.
Habitat change and destruction are the leading causes of extinction.
Evolutionary connections: kin selection and the evolution of altruism.; The gene pool is the sum of all the genes occurring in a population.
Evolution is the change of gene frequencies within a population.
Mutation and the recombination of alleles during sexual reproduction provide sources of variability.
The equilibrium population is a hypothetical population in which evolution does not occur.

The Mechanisms of Evolution
Mutations are the ultimate source of genetic variability.
Migration produces gene flow between populations.
Small populations are subject to random changes in allele frequencies.
Mating within a population is almost never random.
All genotypes are not equally adaptive.

Natural Selection
Natural selection acts on the phenotype, which reflects the underlying genotype.
Natural selection can influence populations in three major ways.
Natural selection takes several forms.

Extinction
Localized distribution and extreme specialization make species vulnerable in changing environments.
Interactions with other organisms may drive species to extinction.
Habitat change and destruction are the leading causes of extinction.
Evolutionary connections: kin selection and the evolution of altruism.; Evolution is the change of gene frequencies within a population.
Mutation and the recombination of alleles during sexual reproduction provide sources of variability.
The equilibrium population is a hypothetical population in which evolution does not occur.

The Mechanisms of Evolution
Mutations are the ultimate source of genetic variability.
Migration produces gene flow between populations.
Small populations are subject to random changes in allele frequencies.
Mating within a population is almost never random.
All genotypes are not equally adaptive.

Natural Selection
Natural selection acts on the phenotype, which reflects the underlying genotype.
Natural selection can influence populations in three major ways.
Natural selection takes several forms.

Extinction
Localized distribution and extreme specialization make species vulnerable in changing environments.
Interactions with other organisms may drive species to extinction.
Habitat change and destruction are the leading causes of extinction.
Evolutionary connections: kin selection and the evolution of altruism.; Mutation and the recombination of alleles during sexual reproduction provide sources of variability.
The equilibrium population is a hypothetical population in which evolution does not occur.

The Mechanisms of Evolution
Mutations are the ultimate source of genetic variability.
Migration produces gene flow between populations.
Small populations are subject to random changes in allele frequencies.
Mating within a population is almost never random.
All genotypes are not equally adaptive.

Natural Selection
Natural selection acts on the phenotype, which reflects the underlying genotype.
Natural selection can influence populations in three major ways.
Natural selection takes several forms.

Extinction
Localized distribution and extreme specialization make species vulnerable in changing environments.
Interactions with other organisms may drive species to extinction.
Habitat change and destruction are the leading causes of extinction.
Evolutionary connections: kin selection and the evolution of altruism.; The equilibrium population is a hypothetical population in which evolution does not occur.

The Mechanisms of Evolution
Mutations are the ultimate source of genetic variability.
Migration produces gene flow between populations.
Small populations are subject to random changes in allele frequencies.
Mating within a population is almost never random.
All genotypes are not equally adaptive.

Natural Selection
Natural selection acts on the phenotype, which reflects the underlying genotype.
Natural selection can influence populations in three major ways.
Natural selection takes several forms.

Extinction
Localized distribution and extreme specialization make species vulnerable in changing environments.
Interactions with other organisms may drive species to extinction.
Habitat change and destruction are the leading causes of extinction.
Evolutionary connections: kin selection and the evolution of altruism.
The Mechanisms of Evolution: Mutations are the ultimate source of genetic variability.
Migration produces gene flow between populations.
Small populations are subject to random changes in allele frequencies.
Mating within a population is almost never random.
All genotypes are not equally adaptive.

Natural Selection
Natural selection acts on the phenotype, which reflects the underlying genotype.
Natural selection can influence populations in three major ways.
Natural selection takes several forms.

Extinction
Localized distribution and extreme specialization make species vulnerable in changing environments.
Interactions with other organisms may drive species to extinction.
Habitat change and destruction are the leading causes of extinction.
Evolutionary connections: kin selection and the evolution of altruism.; Migration produces gene flow between populations.
Small populations are subject to random changes in allele frequencies.
Mating within a population is almost never random.
All genotypes are not equally adaptive.

Natural Selection
Natural selection acts on the phenotype, which reflects the underlying genotype.
Natural selection can influence populations in three major ways.
Natural selection takes several forms.

Extinction
Localized distribution and extreme specialization make species vulnerable in changing environments.
Interactions with other organisms may drive species to extinction.
Habitat change and destruction are the leading causes of extinction.
Evolutionary connections: kin selection and the evolution of altruism.; Small populations are subject to random changes in allele frequencies.
Mating within a population is almost never random.
All genotypes are not equally adaptive.

Natural Selection
Natural selection acts on the phenotype, which reflects the underlying genotype.
Natural selection can influence populations in three major ways.
Natural selection takes several forms.

Extinction
Localized distribution and extreme specialization make species vulnerable in changing environments.
Interactions with other organisms may drive species to extinction.
Habitat change and destruction are the leading causes of extinction.
Evolutionary connections: kin selection and the evolution of altruism.; Mating within a population is almost never random.
All genotypes are not equally adaptive.

Natural Selection
Natural selection acts on the phenotype, which reflects the underlying genotype.
Natural selection can influence populations in three major ways.
Natural selection takes several forms.

Extinction
Localized distribution and extreme specialization make species vulnerable in changing environments.
Interactions with other organisms may drive species to extinction.
Habitat change and destruction are the leading causes of extinction.
Evolutionary connections: kin selection and the evolution of altruism.; All genotypes are not equally adaptive.

Natural Selection
Natural selection acts on the phenotype, which reflects the underlying genotype.
Natural selection can influence populations in three major ways.
Natural selection takes several forms.

Extinction
Localized distribution and extreme specialization make species vulnerable in changing environments.
Interactions with other organisms may drive species to extinction.
Habitat change and destruction are the leading causes of extinction.
Evolutionary connections: kin selection and the evolution of altruism.
Natural Selection: Natural selection acts on the phenotype, which reflects the underlying genotype.
Natural selection can influence populations in three major ways.
Natural selection takes several forms.

Extinction
Localized distribution and extreme specialization make species vulnerable in changing environments.
Interactions with other organisms may drive species to extinction.
Habitat change and destruction are the leading causes of extinction.
Evolutionary connections: kin selection and the evolution of altruism.; Natural selection can influence populations in three major ways.
Natural selection takes several forms.

Extinction
Localized distribution and extreme specialization make species vulnerable in changing environments.
Interactions with other organisms may drive species to extinction.
Habitat change and destruction are the leading causes of extinction.
Evolutionary connections: kin selection and the evolution of altruism.; Natural selection takes several forms.

Extinction
Localized distribution and extreme specialization make species vulnerable in changing environments.
Interactions with other organisms may drive species to extinction.
Habitat change and destruction are the leading causes of extinction.
Evolutionary connections: kin selection and the evolution of altruism.
Extinction: Localized distribution and extreme specialization make species vulnerable in changing environments.
Interactions with other organisms may drive species to extinction.
Habitat change and destruction are the leading causes of extinction.
Evolutionary connections: kin selection and the evolution of altruism.; Interactions with other organisms may drive species to extinction.
Habitat change and destruction are the leading causes of extinction.
Evolutionary connections: kin selection and the evolution of altruism.; Habitat change and destruction are the leading causes of extinction.
Evolutionary connections: kin selection and the evolution of altruism.; Evolutionary connections: kin selection and the evolution of altruism.

Legal Statement