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Bio 100 Exam 3 (Jaeger UNLV) | Questions And Answers Latest {} A+ Graded | 100% Verified
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Bio 100 Exam 3 (Jaeger UNLV) | Questions And Answers Latest {} A+ Graded | 100% Verified
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Bio 100 Exam 3 (Jaeger UNLV) | Questions And Answers Latest {2024- 2025} A+ Graded |100% Verified
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 - tendons and ligaments
---attach bone to muscle or bone to bone
3 special connective tissues - cartilage
bone
blood
cartilage - joint cartilage -- lines bone
absorbs shock -- disks between vertebrae
more flexible cartilage : ears, nose
bone - structure. protection, movement
storage of lipids, minerals and production of red blood cells
, blood - main function is transport
3 types of muscle tissue - skeletal
cardiac
smooth
skeletal muscle tissue - cylindrical, striated cells (actin and myosin) with many nuclei
VOLUNTARY CONTRACTION
cardiac muscle tissue - branching, striated cells with 1 nucleus -- wall of heart, pumps
INVOLUNTARY CONTRACTION
smooth muscle tissue - non-striated, 1 nucleus -- walls of intestines, blood vessels, etc
INVOLUNTARY CONTRACTION - constricts
nervous tissue - nervous system -- nerves, brain, spinal cord
2 nervous tissue cell types: - neurons and neuroglia
neurons - generate and conduct nerve impulses
neuroglia - provide nutrients, insulate and protect neurons
organ - a structure composed of two or more tissues that work together
integumentary system - physical and chemical protection
protection from organisms
limists water loss- keratin
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