histórico mendel
TRANSCRIPT
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Na aula anterior…
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Na aula anterior…
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Na aula anterior…
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Na aula anterior…
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Na aula anterior…
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Os estudos de Mendel
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Quem foi Mendel?
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Brünn
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Os experimentosde Mendel
Ele escolheu bem o material dos experimentos!
Ervilhas de jardim (Pisum sativum)
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Pólen
Pétalas bemfechadas!!!
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Controle sobre a reprodução das plantas
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Controle sobre a reprodução das plantas
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Controle sobre a reprodução das plantas
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Os experimentosde Mendel
Ele analisou cada característica por vez
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Sementes Lisas
Sementes Rugosas
Sementes Verdes
Sementes Amarelas
Vagem inflada Vagem comprimida
Vagem verde Vagem amarela
Flor Púrpura Flor Branca
Flor na posiçãoterminal
Flor ao longodos ramos
Plantaalta
Plantabaixa
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P
F1
O Caráter “baixo”desapareceu na
geração F1!
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F2
F1O caráter“baixo”
reaparece
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Proporcionalmente, quantas plantasda geração F1 eram altas ?
P
F1
Nasceram 4 plantas na geração F1. Destas, 4 plantas eram altas.
4_________ = 1
4
Para expressar em porcentagem (ou seja, emcada cem):
1 ( x 100) = 100%
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F1
F2
Proporcionalmente, quantas plantasda geração F2 eram altas ?
Nasceram 4 plantas na geração F2. Destas, 3 plantas eram altas.
3_________ = 0,75
4
Para expressar em porcentagem (ou seja, emcada cem):
0,75 ( x 100) = 75%
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F1
F2
Proporcionalmente, quantas plantasda geração F2 eram baixas?
Nasceram 4 plantas na geração F2. Destas, 1 planta era baixa.
1_________ = 0,25
4
Para expressar em porcentagem (ou seja, emcada cem):
0,25 ( x 100) = 25%
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F1
500 plantas375 altas
125 baixasF2
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Proporcionalmente, quantas plantasda geração F2 eram altas ?
Nasceram 500 plantas na geração F2. Destas, 375 plantas eram altas.
375_________ = 0,75
500
Para expressar em porcentagem (ou seja, emcada cem):
0,75 ( x 100) = 75%
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F2
F1O caráter“baixo”
reapareceO caráter“baixo”
deveria estar“escondido” na
geração F1…
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A B
A Bé dominante sobre
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B b
B B b b
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P
F1
B B b b
BB bb
B b B b
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F2
F1B bB BBB bbb bB b
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B b
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B B
R R
B B
r r
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Figura (temos 2 cromossomos)
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Meiose
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AA
Aa Aa aa
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Questão 1
• Em um cruzamento entre ervilhas amarelas, nasceram ervilhas verdes e amarelas, qual o genótipo das ervilhas que foram cruzadas?
_____ x _____
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Questão 2
• Nos cruzamentos abaixo quais as possibilidades de descendentes:
a) Ervilha lisa Ervilha (homozigota) X rugosa
b) Ervilha flor X Ervilha florbranca branca
c) Planta alta X Planta baixa(heterozigota)
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Questão 3
• Cruzando ervilhas:Amarelas X Verdes(Filha de uma Verde)
Formaram 1000 plantas.Quantas são:Amarelas Verdes