chi squared

• what kind of ratios do genetic crosses give


  Expected offspring ratios
• why might the expected and the observed ratios be different


  due to chance
• when are expected ratios produced


  when a genetic cross is used
• what are observed ratios


  these are the actual ratios
• What is a null hypothesis?


  this is when there is no significant difference between the observed and the expected
• when would you reject the null hypothesis


  when the chi squared value is more than the table value
• when would you accept the null hypothesis

  when the chi squared value is less than the table value
• how do you find the chi squared value


  (observed - expected)^2/expected , for each category added up
• what is the degrees of freedom equal to


  1 less then the number of catagories