ANSC 3500 EXAM 3 QUESTIONS AND CORRECT ANSWERS

ANSC 3500 EXAM 3 QUESTIONS AND
CORRECT ANSWERS
OurA2mainA2goalA2asA2animalA2breedersA2isA2toA2identifyA2theA2BESTA2animalsA2toA2beA2th
eA2parentsA2ofA2theA2nextA2generation.A2RegardingA2geneticA2prediction,A2afterA2readingA2t
heA2statementsA2below,A2selectA2theA2optionA2whereA2allA2theA2statementsA2areA2FALSE.

1.MassA2selectionA2isA2theA2mainA2methodA2usedA2byA2breedingA2companiesA2toA2calculat
eA2BreedingA2ValuesA2(BV)

2.AA2traitA2withA2highA2heritabilityA2isA2aA2goodA2indicatorA2ofA2anA2animal'sA2performance.

3.EBVsA2forA2sex-
limitedA2traitsA2areA2betterA2predictedA2whenA2usingA2theA2massA2selectionA2method.

4.TheA2animalA2modelA2makesA2useA2ofA2theA2performanceA2informationA2fromA2relativesA
2toA2estimateA2theA2BVA2ofA2anA2animal.A2-A2Ans--1A2andA23


ItA2wasA2developedA2byA2HazelA2andA2isA2aA2methodA2toA2combineA2traitsA2inA2anA2econo
micallyA2optimalA2way.A2-A2Ans--SelectionA2Index

TA2orA2F.A2YourA2goalA2asA2anA2animalA2breederA2isA2toA2geneticallyA2improveA2theA2perfor
manceA2ofA2aA2populationA2byA2identifyingA2andA2rankingA2theA2bestA2animals.A2TheA2firstA
2stepA2inA2aA2breedingA2programA2isA2toA2selectA2andA2mateA2theA2bestA2animals.A2AfterA2t
hat,A2aA2breedingA2goalA2canA2beA2defined,A2andA2theA2programA2evaluated.A2-A2Ans--
False

AmongA2theA2differentA2methodsA2usedA2forA2geneticA2prediction,A2withA2_____________,
A2itA2isA2possibleA2toA2estimateA2BVsA2usingA2geneticA2andA2environmentalA2differencesA2i
nA2theA2performanceA2data.A2-A2Ans--BLUP

T/
F.A2BLUPA2isA2theA2mainA2methodA2usedA2byA2breedingA2companiesA2toA2estimateA2theA2g
eneticA2valueA2ofA2anA2animal.A2-A2Ans--true

TheA2_______A2measuresA2theA2geneticA2valueA2ofA2anA2individualA2asA2aA2geneticA2pare
nt.A2Thus,A2aA2bullsA2_______A2isA2simplyA2theA2superiorityA2orA2inferiorityA2ofA2hisA2proge
nyA2multipliedA2byA22.A2-A2Ans--EBV,A2EBV

WhatA2isA2TRUEA2aboutA2accuracy?

1.A2ItA2isA2higherA2forA2higherA2h2A2atA2theA2sameA2numberA2ofA2progenies.

, 2.A2AsA2aA2correlation,A2itA2rangesA2fromA2-1A2toA21.

3.TheA2higherA2theA2accuracy,A2theA2moreA2likelyA2theA2EBVA2isA2toA2predictA2theA2animal'
sA2trueA2breedingA2value.

4.NegativeA2accuraciesA2meanA2thatA2theA2EBVA2isA2notA2aA2goodA2predictorA2ofA2theA2TR
UEA2breedingA2value.

5.A2AccuracyA2isA2theA2bestA2geneticA2measureA2toA2selectA2superiorA2parents.A2-A2Ans--
1A2andA23

AllA2selectionA2pressureA2isA2putA2onA2aA2singleA2traitA2ofA2interestA2untilA2theA2performanc
eA2ofA2theA2herdA2reachesA2aA2levelA2thatA2theA2breederA2desires,A2atA2whichA2pointA2anot
herA2traitA2uponA2whichA2toA2focusA2selectionA2isA2chosenA2-A2Ans--TandemA2Selection

AA2breederA2choosesA2minimumA2orA2maximumA2levelsA2forA2eachA2traitA2thatA2needsA2toA
2beA2improved.A2AnyA2animalA2notA2meetingA2allA2criteriaA2isA2notA2selectedA2forA2useA2inA2
theA2breedingA2programA2-A2Ans--IndependentA2culling

TheA2rankingA2ofA2animalsA2isA2basedA2onA2aA2valueA2calculatedA2byA2givingA2eachA2selec
tedA2traitA2aA2"relativeA2weight."A2-A2Ans--IndexA2ofA2selection

UsedA2whenA2pedigreeA2informationA2isA2notA2availableA2-A2Ans--IndividualA2Selection

SelectionA2ofA2theA2individualsA2basedA2onA2theA2averageA2performanceA2ofA2theirA2proge
ny.A2-A2Ans--ProgenyA2test

T/F.A2TheA2progenyA2testA2increasesA2theA2accuracyA2ofA2selection.A2-A2Ans--True

T/
F.A2InA2theA2presenceA2ofA2anA2unfavorableA2correlationA2betweenA2twoA2traits,A2TandemA
2SelectionA2isA2theA2bestA2methodA2forA2improvingA2bothA2traits.A2-A2Ans--False


T/
F.A2SelectionA2forA2aA2singleA2traitA2isA2theA2quickestA2wayA2toA2makeA2progressA2inA2thatA2
individualA2trait.A2However,A2becauseA2animalsA2andA2theA2economicsA2ofA2livestockA2pro
ductionA2areA2complex,A2thisA2simpleA2methodA2isA2generallyA2notA2practical.A2-A2Ans--
True

T/
F.A2InA2individualA2selection,A2allA2individualsA2areA2measured,A2andA2theA2decisionA2toA2s
electA2orA2toA2cullA2anA2animalA2isA2basedA2solelyA2onA2thatA2animal'sA2phenotypicA2value.A
2-A2Ans--True