Corn genetics chi square goodness of fit test l.jpg
Sponsored Links
This presentation is the property of its rightful owner.
1 / 17

Corn Genetics & Chi- Square Goodness of Fit Test PowerPoint PPT Presentation


  • 330 Views
  • Uploaded on
  • Presentation posted in: General

Corn Genetics & Chi- Square Goodness of Fit Test. Pedigrees and probability analysis to follow. Outline. Highlight some key points in syllabus Corn color and collection of data (phenotypes) Chi-Square Analysis. Corn genetics Lab. Application of Chi-Square Analysis.

Download Presentation

Corn Genetics & Chi- Square Goodness of Fit Test

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Corn Genetics &Chi- Square Goodness of Fit Test

Pedigrees and probability analysis to follow.


Outline

  • Highlight some key points in syllabus

  • Corn color and collection of data (phenotypes)

  • Chi-Square Analysis


Corn genetics Lab


Application of Chi-Square Analysis

  • The color pattern in corn is due to multiple genes

  • Are variations in number of observed phenotypes due to chance alone?


Objective

  • Complete corn worksheet

  • Set up Punnett Squares using the genotypes given

  • Compare expected data to observed data

  • Perform Chi Square Analysis


Variation of colors—Why?


Corn Kernel Color

  • 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!


Gene interaction can occur:Epistasis is a form of gene interaction in which one gene masks the phenotypic expression of another.


Today there are: 3 crosses of corn

F1 X F1

Multiple alleles are tested for expression in F2 generation


Note color differences

  • 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

Cross C


F1 phenotype

F1 X F1 genotypes

Purple

yyPpRr X yyPpRr

Cross D


F1 phenotype

F1 X F1 genotypes

Purple

yyCcRr X yyCcRr

Cross F


Chi Square Statistical “Goodness of Fit Test”

  • 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


Application of Chi Square


Genetic information regarding the corn color patterns are provided in your lab manual.

CORN WORKSHEET IS DUE 3/5


  • Login