ANSC 305 TEST 3 QUESTIONS AND CORRECT ANSWERS

ANSC 305 TEST 3 QUESTIONS AND
CORRECT ANSWERS
QuantitativelyA2inheritedA2characteristicsA2areA2thoseA2whereA2differencesA2amongA2anim
alsA2areA2dueA2to...A2-A2Ans--1)A2DifferencesA2inA2genotypeA2atA2manyA2differentA2loci
2)A2EnvironmentalA2influences
3)GenotypeA2environmentA2interactions

GenotypeA2EnvironmentA2InteractionsA2(GEI's)A2-A2Ans--
ThereA2isA2aA2GEIA2ifA2theA2differenceA2inA2theA2avgA2performanceA2ofA2theA2animalsA2inA22
A2differentA2geneticA2groupsA2isA2differentA2inA2twoA2differentA2environments


CausesA2ofA2GEI'sA2-A2Ans--
1)A2AnimalsA2ofA2theA22A2geneticA2groupsA2canA2differA2inA2theirA2geneticA2potentialA2forA2t
heA2traitA2ofA2concern
2)A2AnimalsA2ofA2theA22A2differentA2geneticA2groupsA2canA2differA2inA2theirA2levelsA2ofA2ada
ptionA2toA2theA2differentA2environment
3)A2TheA2degreeA2ofA2adaptationA2ofA2aA2particularA2geneticA2groupA2toA2aA2particularA2env
ironmentA2determinesA2howA2muchA2ofA2theA2geneticA2potentialA2canA2beA2achievedA2und
erA2theA2stressA2associatedA2withA2thatA2particularA2environment

GeneticA2potentialA2-A2Ans--
TheA2highestA2performanceA2thatA2animalsA2ofA2thisA2geneticA2groupA2couldA2achieveA2inA
2theA2absenceA2ofA2environmentalA2stress


TransmittingA2abilityA2-A2Ans--
TheA2avgA2amountA2thatA2anA2infinitelyA2largeA2numberA2ofA2anA2animalsA2progenyA2would
A2differA2fromA2theA2progenyA2ofA2anA2animalA2withA2aA2transmittingA2abilityA2ofA2zero


HeritabilityA2-A2Ans--
AA2measureA2ofA2howA2well,A2onA2theA2avg,A2thatA2animal'sA2ownA2phenotypesA2indicateA2t
heirA2transmittingA2abilityA2forA2aA2particularA2characterA2(0-1)

HighA2h2A2=A2-A2Ans-->.4

ModerateA2h2A2=A2-A2Ans--.2-.4

LowA2h2A2=A2-A2Ans--<.2

SelectionA2responseA2-A2Ans--
TheA2changeA2inA2theA2avgA2ofA2aA2characterA2dueA2toA2selectionA2(changeA2overA2time)

, SelectionA2differentialA2-A2Ans--
TheA2avgA2amountA2thatA2selectedA2animalsA2differA2fromA2theA2avgA2ofA2theA2groupA2from
A2whichA2theyA2wereA2selected


SelectionA2responseA2=A2-A2Ans--h2(selectionA2differential)

GenerationA2intervalA2-A2Ans--
TheA2avgA2ageA2ofA2animalsA2whenA2theyA2produceA2offspring,A2whichA2willA2beA2longerA2t
hanA2theA2ageA2atA2whichA2theyA2produceA2theA21stA2offspringA2andA2shorterA2thanA2theA2a
geA2atA2whichA2theyA2leaveA2theA2herd;A2TheA2avgA2amountA2ofA2timeA2betweenA2generati
ons

GenerationA2intervalA2ofA2beefA2cattleA2-A2Ans--5A2yrs

GenerationsA2intervalA2ofA2dairyA2cattleA2-A2Ans--4A2yrs

GenerationA2intervalA2ofA2sheep/goatA2-A2Ans--3A2yrs

GenerationA2intervalA2ofA2horsesA2-A2Ans--9-10A2yrs

GenerationA2intervalA2ofA2hogsA2-A2Ans--2A2yrs

ASRA2(AnnualA2selectionA2response)A2-A2Ans--SelectionA2responseA2perA2year

ASRA2=A2-A2Ans--h2(selectionA2differential)/generationA2interval

StandardizedA2selectionA2differentialA2(i)A2=A2-A2Ans--selectionA2differential/
phenotypicA2stdA2deviation

phenotypicA2stdA2deviationA2-A2Ans--
AA2measureA2ofA2variabilityA2thatA2definesA2anA2intervalA2whereA2aboutA268%A2ofA2theA2ani
malsA2willA2beA2betweenA2oneA2phenotypicA2stdA2devA2belowA2avgA2andA2oneA2phenotypic
A2stdA2devA2aboveA2avg


GeneticA2correlationA2-A2Ans--
AA2measureA2ofA2theA2correspondenceA2betweenA2theA2TA'sA2ofA22A2differentA2characters
A2(betweenA2-1A2andA2+1)


PhenotypicA2correlationA2-A2Ans--
AA2measureA2ofA2theA2correspondenceA2betweenA2theA2phenotypeA2ofA2theA22A2differentA2
charactersA2(betweenA2-1A2andA2+1)

TheA2absoluteA2valueA2ofA2theA2geneticA2correlationA2betweenA22A2charactersA2isA2typicall
yA2_________________A2thanA2theA2absA2valueA2ofA2phenotypicA2correlationA2-A2Ans--
larger