Inheritance 1
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Transcript of Inheritance 1
![Page 1: Inheritance 1](https://reader034.fdocuments.in/reader034/viewer/2022052619/55661fa6d8b42a7d608b525f/html5/thumbnails/1.jpg)
By
Hasimah Azit
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Observe this picture.What conclusion you can give from this picture?
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Question?
• Are they difference?
• What is the differences between them?
• Do they have any similiar characteristic ?
• Where do they get all these characteristics?
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Observe the diagram!
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What color is the parent?
What is the characteristic of the first filial?
What is the characteristic of the second filial?
What is the propotion between the color?
3 yellow : 1 green
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State • The color of parent flower
• The color of offspring flower
• Where the color goes?
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State: • What is obvious color of the flower?
• purple
• Predict the color of offspring flowers
• Purple and white
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What
• Trait can be observe?
• Cant be seen in one generation?
• Less color in the offspring?
• What is the name of the trait that can be seen regularly
• What is the name the trait that seldom be seen
• What factor controling the trait??
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• Trait always can be seen = dominance trait
• Trait seldom be seen = recessive trait
• Dominance trait is control by dominance factor
• Recessive trait is control by recessive factors
• The factor is called gene
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Gene and alelle• Every trait is control by a gene
• Gene consist of two allele
• Each allele is located at a chromosome
U
1 chromosome
1 allele
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Gene dan allele
Trait – control by a pair of allele at homolog chromosome
What is homolog chromosome?
Homolog chromosomes pairsChromosomes in the cell
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Gene dan allele
TT
Homolog chromosomes
Allele Allele
Gene consist of 2 allele in sameLocation at
homolog chromosomes
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• The yellow color bean is control by dominance gene (K)
• = KK
• The green color bean is control by ressesive gene (k)
• = kk
• Heterozygote form: = Kk
• The color is yellow, yellow is dominance
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KK
Yellow parent X Green parent
kk
K K k k
Kk KkKk Kk
KKkkKkKk
kK K k
gamete
F1
F1 X F1
gamete
F2
yellow yellow yellow green
meiosis
fertilization
meiosis
fertilization
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Try again: • Parent : yellow X green
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For F2 generation:
• Use Punnet square:
Gamete maleGamete
female
K k
K
k
KK Kk
Kk kk
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What is.. • Parent genotype ?
• Parent Phenotype ?
• Genotype F1
• Phenotype F1
• Genotype F2
• Phenotype F2
• Phenotype ??? Genotype ???
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•Genotype = type of allele that control the trait
•Phenotype = the characteristic can be seen
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So:-• KK = pure breed (homozygote) - yellow
• Kk = hybrid (heterozygote) - yellow
• kk = pure breed (homozygote) – green
• Practice: −Do the cross of the following:
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Kaji rajah berikut
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What is the conclusion can be made?
• Trait is control by a pair of allele, only an allele can be inherited in gamete.
First Mendel Law(Law of Segregation)
any pair of characteristics there is only one gene in a gamete even though there are two genes in ordinary cells.
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Think ...
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Practice:
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Two trait inherited.Each trait is controlled control by two alleleEach of the allele from any trait able to combine during gamete formation in meiosis .
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Female DrosophilaPurple eyeBlack body
Male DrosophilaRed eyeBrown body .
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Key:U – dominance allele for purple eyeU – recessive allele for red eyeH- dominance allele for black bodyH – recessive allele for brown body
Draw schematic diagram to show the inheritance of the trait in F1 and F2 generation.
UUHH X uuhhParent
Gamete UH uh
First filialGeneration (F1) UuHh
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Random cross between F1 with any of F1
UuHh X UuHh
Gamete: UH Uh uH uh UH Uh uH uh
F2: UH Uh uH uh
UH
Uh
uH
uh
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Phenotype Number
Purple eye, brown body
Purple eye, black body
Red eye, black body
Red eye, brown body
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Mendel's Law of Independent Assortment
two characteristics the genes are inherited independently.