Chapter 13 Flashcards
A genetic drift resulting from a drastic reduction in population size
Bottleneck effect
The study of the geographic distribution of species
Biogeography
The comparison of body structures in different species
Comparative anatomy
Natural selection that acts in favor of the individuals at one end of the phenotypic range
Directional selection
Natural selection that favors extreme over intermediate phenotypes
Disruptive selection
Descent with modification; genetic change in population or species over generation; the heritable changes that have produced Earth’s diversity of organisms
Evolution
A populations increase in the frequency of trait suited to the environment
Evolutionary adaptation
A branching diagram that reflects a hypothesis about evolutionary relationships between groups of organisms
Evolutionary tree
The order and sequence of fossils as they appear in rock layers marking the passage of geologic time
Fossil record
A preserved in print or remains of an organism that lived in the past
Fossil
The genetic drift resulting from the establishment of small, new population whose gene pool differs from that of the parent population
Founder effect
The gain or loss of alleles from a population by the movement of the individuals or gametes into or out of the population
gene flow
All the genes in a population at any one time
Gene pool
A change in a gene pool of the population due to chance
Genetic drift
The condition describing a non-involving population
Hardy Weinberg equilibrium