genes ligados ou

8/9/2019 Genes Ligados Ou

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GENTICA

Genes Ligados ouLinkagePrf. Portuga


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Genes Ligados ouLinkage- Thomas Hunt Morgan descobriu a relaoentre a distnciae a probabilidade de permuta entre doisgenes ligados.-Genes ligados: So diferentes pares degenes que esto nos

mesmos cromossomos homlogos.


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-O crossing over ou permuta poderecombinar os

diferentes pares de genes dos mesmoscromossomoshomlogos em vrias formas.-Todo o cromossomo mede 100 unidadesde recombinao oumorgandeos ou centimorgans.

- A distncia que separa os genes numericamente igual soma das percentagens dos gametasrecombinantes,permutados ou que sofreram crossing

over.


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ComparaoDiibridismo/LinkageDiibridismo (AaBb)A


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aB

bGametasA BA ba Ba b

25%25%25%25%


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ComparaoDiibridismo/LinkageGenes Ligados Linkage Sem

crossing over (AaBb)


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Aab

GametasBAab50%50%B


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ComparaoDiibridismo/LinkageGenes Ligados Linkage Sem

crossing over (AaBb)


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Aab

GametasRecombinantesBAab40%40%

BGametasParentaisAbaB10%10%


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Genes Ligados -LinkageNa vinculao gnica a posio dos

genes no


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heterozigoto (AaBb) pode ser Cis ouTrans.

Estas posies tambm podem serutilizadas para sedefinir quem so os gametas parentais eosrecombinantes.

ABabPosio CISAbaBPosio TRANS


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MapeamentoGentico


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Mapa gentico oucromossmico arepresentao da posio dosgenes nocromossomo.

Est diretamente relacionada ataxade crossing.Unidades de Recombinao

(U.R.) ouMorgandeos (M) so asunidadesusadas para determinar a

posio dosgenes no cromossomo ecorrespondema taxa de crossing.


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25%B-D

45% A-C

20% C-B


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Mapeamento

Gentico1.0) Em um cromossomo h aseguintefreqncia de recombinao entre os

genesA,B,C e D:A-B

5% C-D

20% A-D

40%Qual a posio dos genes nocromossomo?


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MapeamentoGenticoA

C


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DB

45M40M20M20M5M


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Genes Ligados:Exerccios2.0)Suponha que a distncia entre

os loci a e b


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seja de 17 unidades morgandeas. Quais as porcentagens que

aparecem osgametas de gentipo ab/AB?

b) Quais gametas apresentamrecombinao?


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Genes Ligados:Exerccios3.0) Um indivduo de gentipo desconhecido foi

cruzado com o


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birrecessivo e produziu os seguintesdescendentes:AB/ab = 4%

Ab/ab = 46%aB/ab = 46%ab/ab = 4%

d) Que tipos de gametas ele formou e em que

porcentagens?

b) Quais desses gametas so parentais e quaisso recombinantes?

c) Qual o gentipo do indivduo? Ele Cis ou

Trans?d) Qual a distncia dos loci a e b, no mapagentico?


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Genes Ligados:Exerccios

4.0)Considerando-se que um casal duplo

heterozigoto para duas caractersticas eproduziram apenas 2 tipos de gametas na


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proporo de 50% de cada, podemos afirmarque se trata de:a) Um caso de 2 lei de Mendel.

b) linkage sem crossing overc) linkage com 2 lei de Mendel.d) uma herana restrita ao sexoe) linkage com crossing over


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FIM

Uma Boa Semana!Prf. PortugaGenes Ligados ou LinkageApresentao em ppt para aula de Biologia do Ensino Mdio....Genes Ligados ouLinkage...espero que aproveitem....fiquei uma tarde a fazer....

Reads:5,669

Uploaded:09/03/2009Category:School Work>Essays & ThesesTags:genes

pptbiologia

geneticalinkagelinkage ensinolinkage ppt(More)genes

pptbiologiageneticalinkagelinkage ensino

linkage pptaula linkageexercicios linkage

permutalinqage mapeamentolinkagem mapeamentolinkage exerciciosexerciciomapeamento genetico(Less)Rated:

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