Bio 100 Exam 3 (Jaeger UNLV)
Questions and Answers
Evolution
✓ ~~~ Any genetically based change of phenotype in a population over successive
generations
Common Decent with Modification
✓ ~~~ species undergo modification through successive generations
✓ changes in species can lead to formation of new, separate species
Species
✓ ~~~ different kinds of organisms
✓ individuals of the same species share genetic similarity and can potentially interbreed
population
✓ ~~~ all the individuals of the same species occupying a specific area over a particular
time
Fitness
✓ ~~~ successful reproduction - leaving behind copies of yourself
natural selection
✓ ~~~ agent of evolution
the process through which a trait or character that confers reproductive advantage to
an individual spreads in a population over successive generations
biotic potential
, ✓ ~~~ most populations are capable of producing more offspring then can be supported by
the environment
heritable
✓ ~~~ pass it onto the next generation
overtime...
✓ ~~~ the beneficial traits spread through the population
Competition for natural selection
✓ ~~~ genetic traits that provided an advantage will be spread within a population, but
those tat do not will be lost from the population
What evolves?
✓ ~~~ populations
Evolution of acquired characters
✓ ~~~ overtime, an organism could acquire enough changes that one species could
diverge into two
this branching extended back in time, ancestral species to ancestral species and so
on
Five agents of evolution:
✓ ~~~ natural selection
sexual selection
gene flow
genetic drift
, mutation
mutation
✓ ~~~ a change in DNA sequence
mutation is
✓ ~~~ the means by which new genetic information is generated...most are detrimental or
harmless, but a rare few are beneficial to an organisms fitness
beneficial mutation
✓ ~~~ building blocks of evolutionary change
whose theory was "Shorter Neck Giraffes Dieing"
✓ ~~~ Darwin's Theory
gene flow
✓ ~~~ the movement of alleles from one population to another by migration
gene flow introduces
✓ ~~~ 'novel' alleles to a population from some other population
genetic drift
✓ ~~~ chance alteration of allele frequencies in a population
founder effect
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