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Chapter 4

BI226 Chapter 4 LN.docx

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Department
Biology
Course
BI226
Professor
Robert Boulianne
Semester
Spring

Description
Chapter4ModificationofMendelianRatiosLectureNotesSomeTerminologyWildTypeAlleleoAllelethatoccursmostfrequentlyinpopulationoDesignatedasorwtMutantAlleleoLossoffunctionmutationNullmutationifcompletelossoffunctionoGainoffunctionmutationUsuallydominantoNeutralmutationNoeffectAlleleSymbolsaahomozygouswildtypeoOraaheterozygouswildtypeoOraahomozygousmutantoOrTheslashshowsthedifferencebetweenthe2homologsIncompleteDominanceWhenonealleleisnotcompletelydominanttoanotherthenitissaidtoshowincompleteorpartialdominanceThephenotypeoftheheterozygoteisintermediatetothoseofthehomozygotesClassicexampleoFlowercolourinsnapdragonsRedfloweredwhitefloweredProgenyareallpinkfloweredDontusecapitalsorlowercasebecausenotdominantorrecessivethereforeweusesubscriptsPlumageColourinChickensIncompleteDominanceBBWWCrossesbetweentruebreedingblackCCandwhiteCCbirdsproducesanBWFthatisbluishgreyCCcalledanAndulasian1AnAndulasiancrossedtoanotherAndulasianproduceso1black2Andulasian1whitefowloWhenAndulasiansbreedtogethertheydonotbreedtrueallthetimethereforetheyareheterozygousPalominoHorsesIncompleteDominancePalominosdonotbreedtruewhenbredtogetheroProgenyarecremellosextremelylightcoloredpalominosandlightchestnutso121ratioischaracteristicofincompletedominancecrcrcrCCproducesahorsethatislightchestnutorsorrelCCpalaminoandCCthecremellooOthercoatcolourgenesarenecessarybutareatdifferentlocioItisthoughtthatthereareupto7differentlocithatcontributetothecoatcolorofhorsesInotherwordsthepalaminoisaslightdilutionofthesorrelandthecremelloisafurtherdilutiontogiveanevenpalercolourCodominanceTheheterozygotedisplaysbothphenotypesofthetwohomozygotesoIncompletedominancedisplayedintermediatephenotypebetweenthetwohomozygotesABTheABObloodgroupiandiallelesarecodominantallelesoIndividualscanbeABbloodtype
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