Chapter 2 - CH 2 HOMEWORK QUESTIONS + ANSWERS PDF

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CH 2 HOMEWORK QUESTIONS + ANSWERS...

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8/27/2017

Chapter 2

Chapter2 Due:8:30amonWednesday,September13,2017 Youwillreceivenocreditforitemsyoucompleteaftertheassignmentisdue.GradingPolicy

Problem2.6

PartA Identifytheeventsthatcharacterizeeachstageofmitosis. Dragtheappropriateitemstotheirrespectivebins. ANSWER:

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Chromosomesareclearlydouble structures.

Chromosomescoilupandcondense.

Spindlefibersform.

Centromeresalignonmetaphase plate.

Centriolesdivideandmoveapart.

Centromeressplit.

Daughterchromosomesarriveatthe poles.

Daughterchromosomesmigrateto oppositepoles.

Cytokinesiscommences.

Centriolesreachtheoppositepoles.

Correct

Problem2.7 Howarechromosomesnamedonthebasisoftheircentromereplacement?

PartA Dragthetermsonthelefttotheappropriateblanksontherighttocompletethesentences. ANSWER:

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Ina(n) telocentric chromosome,thecentromereislocatedattheend.

 Ina(n) acrocentric chromosome,thecentromereislocatedclosetotheend.  Ina(n) submetacentric chromosome,thecentromereislocatedbetweenthemiddleandtheend.

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Ina(n) metacentric chromosome,thecentromereislocatedinthemiddle.

Correct

Problem2.13 Contrastspermatogenesisandoogenesis.

PartA Drageachdescriptiontotheappropriatebin.Ifadescriptionappliestobothspermatogenesisandoogenesis,dragittothelastbin. ANSWER:

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occursinfemales occursinmales

producesspermatids daughtercellsreceiveequalamounts ofgeneticmaterial

producespolarbodiesandootids daughtercellsreceiveequalamounts ofcytoplasm

daughtercellsreceiveunequal amountsofcytoplasm

Correct

Problem2.15 Adiploidcellcontainsthreepairsofhomologouschromosomesdesignated chromosomeswillbepresentin

and

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and

,and

and

;nocrossingoveroccurs.Whatpossiblecombinationsof

PartA daughtercellsfollowingmitosis? Checkallthatapply. ANSWER:

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PartB thefirstmeioticmetaphase? Checkallthatapply. ANSWER:

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PartC haploidcellsfollowingbothdivisionsofmeiosis? Checkallthatapply. ANSWER: ,

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Correct

Problem2.16 AdiploidcellcontainsfourpairsofhomologouschromosomesdesignatedC1andC2,M1andM2,S1andS2,andW1andW2.

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Chapter 2

PartA Predictthenumberofdifferenthaploidcellsthatcouldbeproducedbymeiosis. ANSWER: 16

Correct

Problem2.18

PartA Whatistheprobabilitythat,inanorganismwithahaploidnumberof13,aspermwillbeformedthatcontainsall13chromosomeswhosecentromereswerederivedfrommaternal homologs? Expressyouranswerwithtwosignificantfigures. ANSWER: 1.2×10−4

Correct

Problem2.24

PartA Ifonefollows

primaryoocytesinananimalthroughtheirvariousstagesofoogenesis,howmanysecondaryoocyteswouldbeformed?

ANSWER: 110

Correct

PartB Howmanyfirstpolarbodieswouldbeformed? ANSWER: 110

Correct

PartC Howmanyootidswouldbeformed? ANSWER: 110

Incorrect;correctanswerdisplayed

PartD Ifonefollows

primaryspermatocytesinananimalthroughtheirvariousstagesofspermatogenesis,howmanysecondaryspermatocyteswouldbeformed?

ANSWER: 220

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Chapter 2

Correct

PartE Howmanyspermatidswouldbeformed? ANSWER: 440

Correct

Problem2.25 ThenuclearDNAcontentofasinglespermcellvariesdependingonthespeciesoftheorganism. IftheamountofDNAinasinglespermcellis

picogram(s),calculatetheamountofDNAatdifferentstagesofmeiosisormitosis.

PartA WhatwouldbetheexpectednuclearDNAcontentofaprimaryspermatocyteinthesameorganism? ANSWER: 6.2 picograms

Correct

PartB WhatwouldbetheexpectednuclearDNAcontentofasomaticcell(nonsexcell)intheG1phase? ANSWER: 3.1 picograms

Correct

PartC WhatwouldbetheexpectednuclearDNAcontentofasomaticcellatmetaphase? ANSWER: 6.2 picograms

Correct

Problem2.26 Consideradiploidcellthatcontainsthreepairsofchromosomesdesignated

,

,and

.Eachpaircontainsamaternalandapaternalmember(e.g.,

and

,etc.).

PartA Inmitosis,whatchromatidcombination(s)willbepresentduringmetaphase? Checkallthatapply. ANSWER:

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Chapter 2

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PartB Whatcombination(s)willbepresentateachpoleatthecompletionofanaphase? Checkallthatapply. ANSWER:

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Problem2.27 ConsideradiploidcellthatcontainsthreepairsofchromosomesdesignatedAA,BB,andCC.Eachpairincludesamaternalandapaternalmember(e.g.,AmandAp.)

PartA AftermeiosisI,assumingnocrossingover,whatcombinationsofchromosomesarepossibleinthetwoproductcells?Selectallthatapply. ANSWER:

m,Bp,Cp p,Bm,Cp p,Bp,Cm m,Bm,Cm p,Bm,Cm m,Bp,Cm p,Bp,Cp m,Bm,Cp

Correct ScoreSummary: Yourscoreonthisassignmentis98.6%.  Youreceived13.8outofapossibletotalof14points.

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