Bio 100 Exam 3 (Jaeger UNLV)
Questions and Answers
biotic potential
✓ ~~~ most populations are capable of producing more offspring then can be supported by
the environment
heritable
✓ ~~~ pass it onto the next generation
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
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
✓ ~~~ colonization of new habitat y a few individuals that give rise to a new population.
note: founding individuals do not represent the total genetic variation in original population
genetic drift - population bottleneck
✓ ~~~ survival is random, surviving individuals do not represent the genetic diversity of the
original population, new population arises
sexual selection
✓ ~~~ differential reproductive success based on differences in the success of obtaining
mates
-female mate choice
-male dominant systems
-both are non random mating
allopatric speciation
✓ ~~~ occurs when the geographical range of a species is split into discontinuous parts by
formation of barriers to gene flow
--populatioins become isolated in different arears
,Evolutionary Tree--Ancestral characters
✓ ~~~ characters existed in the common ancester
Evolutionary Tree--Derived characters
✓ ~~~ characters unique to a certain group
tissue
✓ ~~~ a group of cells of a similar type that work together for a common purpose
four types of tissue
✓ ~~~ epithelial
connective
muscle
nervous
Epithelial
✓ ~~~ covers body surfaces, lines cavities and organs
Three basic shapes of Epithelial Tissue
✓ ~~~ squamous
cuboidal
columnar & in simple (single layer) or stratified forms
connective tissue
, ✓ ~~~ most abundant tissue
binds-tendons and ligaments
supports-cartilage, bones
transports-blood
stores energy-adipose tissue (fat)
Connective tissue defined
✓ ~~~ cells embedded in extracellular matrix composed of protein fibers and ground
substances
3 proper connective tissues
✓ ~~~ areolar
adipose
dense
areolar
✓ ~~~ widely distributed; under skin, around organs and muscles ----for structure and
cushioning
adipose
✓ ~~~ (fat) under skin, around organs;
function; energy storage, insulation, cushioning
dense
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