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生物的变异 PowerPoint PPT Presentation


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生物的变异. 北京四中:毕诗秀. 变异的种类. 不可遗传的变异. (改变). (改变). (改变). 表 现 型 = 基 因 型 + 环 境 条 件. 基因重组. 来源. 可遗传的变异. 基因突变. 染色体变异. 一、基因重组. a A. a A. A A. a a. A a. b b. B B. B B. b b. B b. 1 、基因重组类型:. ①非同源染色体上的非等位基因自由组合. ②同源染色体上的非姐妹染色体交叉互换.

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生物的变异

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a A

a A

A A

a a

A a

b b

B B

B B

b b

B b

1


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2

ABAb

3


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()


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CAT

CTT

GTA

GAA

GUA

GAA

-6

mRNA

DNA


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DNA

mRNA

1.


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DNA

TAC CAT TAG GAT CCC ATT

C

DNA

TAC CCA TTA GGA TCC CAT T

T

DNA

TAC CAT AGG ATC CCA TT

mRNA

AUG GUA UCC UAG GGU

mRNA

AUG GUA AUC CUA GGG UAA

  • 2.

mRNA

AUG GGU AAU CCU AGG GUA


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DNA

d1

d2

D

d3


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1


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2


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3


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4

5


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300()


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5

1


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2

21

21


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XO


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1

2


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2n114

2n214

n1n214

2n314

2n12n228

n1n2 n321

2(n1n2 n3)42


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  • 10-12

  • 43


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6n

3n+n

6n+2n

2n


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3

2n=20

6n=2(n1+n2+n3)=42

n=10

3n=n1+n2+n3=21

n=10

3n=n1+n2+n3=21


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33

2

33


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F1

(Dd)(Tt)


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P

P

DDTT

DDTT

ddtt

ddtt

F1

F1

DdTt

DdTt

dt

Dt

dT

DT

F2

ddtt

D_T_

D_tt

ddT_

dt

Dt

dT

DT

ddtt

DDTT

DDtt

ddTT


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1Cc

A B

C D


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1Cc

A B

C D

Cccc ccccB


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  • 2:

  • 1

  • 2

  • 3

  • DNA

  • A 123

  • B 231

  • C 123

  • D 213


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  • 2:

  • 1

  • 2

  • 3

-----

: A


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3

33


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  • 3 37.5

  • A

  • B

  • C

  • D


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  • 37.5

AaAAAaaaaA

A


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4

1 2 3 4 5

1 2 3 4 5

d

b

c

a

3

1 2 4 5

1 2 4 5

4abcd

A

B

C

D


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P

DDTT

ddtt

F1

DdTt

D-T-

D-tt

ddtt

dt

Dt

ddT-

DDTT

B

A

5DTdtAB


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  • AB

  • Dd

  • 2

  • AF1


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  • A

  • DTddTT

  • 13

  • 712

  • DDtt:Ddtt:ddtt=1:2:1


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