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Corn Genetics & Chi- Square Goodness of Fit TestPowerPoint Presentation

Corn Genetics & Chi- Square Goodness of Fit Test

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Corn Genetics & Chi- Square Goodness of Fit Test

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Corn Genetics &Chi- Square Goodness of Fit Test

Pedigrees and probability analysis to follow.

- Highlight some key points in syllabus
- Corn color and collection of data (phenotypes)
- Chi-Square Analysis

Corn genetics Lab

- The color pattern in corn is due to multiple genes
- Are variations in number of observed phenotypes due to chance alone?

- Complete corn worksheet
- Set up Punnett Squares using the genotypes given
- Compare expected data to observed data
- Perform Chi Square Analysis

- Color of aleurone masks endosperm color
- Only with colorless aleurone can endosperm color be determined
- Determined by several genes
- Refer to genotypes in lab manual!

F1 X F1

Multiple alleles are tested for expression in F2 generation

- Cross C
- Cross D (darker color is purple)
- Cross F (call purple, may look red!)

F1 phenotype

F1 X F1 genotypes

Yellow

YYC’Rr X YYC’Rr

F1 phenotype

F1 X F1 genotypes

Purple

yyPpRr X yyPpRr

F1 phenotype

F1 X F1 genotypes

Purple

yyCcRr X yyCcRr

- Why do we use it?
- .

- To find out determine if probability are due to chance alone.

An example of how to calculate a Chi Square

CORN WORKSHEET IS DUE 3/5