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Corn Genetics Lab: Notebook Format Title/Date Pre-lab -Materials List ONLY

Corn Genetics Lab: Notebook Format Title/Date Pre-lab -Materials List ONLY -(The rest of the pre-lab is the same as the Candy Lab.) Purposes (2-3) Personal Account Hypothesis #1 (dominant trait & recessive trait) Hypothesis #2 (predicted parental cross) Procedure

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Corn Genetics Lab: Notebook Format Title/Date Pre-lab -Materials List ONLY

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  1. Corn Genetics Lab: Notebook Format • Title/Date • Pre-lab • -Materials List ONLY • -(The rest of the pre-lab is the same as the Candy Lab.) • Purposes (2-3) • Personal Account • Hypothesis #1 (dominant trait & recessive trait) • Hypothesis #2 (predicted parental cross) • Procedure • Chi Square Calculation Table • ID: Degrees of freedom, p-value, & critical value • Discussion • A) Did you accept or reject your null hypothesis? Why? • B) What conclusions can you make about the parents • of the ear you counted? • Conclusion/Wrap-Up

  2. Lab: Genetics of Corn – playing the role of Mendel • Each set of partners should obtain one ear of corn. • Study the ear and select 2 different traits that are easy to recognize. • Make a chi-square table with the 4 possible phenotypes. • Categorize the kernels on the entire ear by using tally marks for each of the • 4 phenotypes. Use 1 pin to mark the row that you started on and another • to mark the current row you are counting. • Count your tallies and record your data in the chi-square table. • Based on your observations of kernels and the ratios you counted, • hypothesize which traits are dominant & which are recessive. Then • hypothesize the genotypes of the parents that created the ear that you • just counted. This will allow you to predict a ratio/number of offspring from • the total number of kernels counted…your “expected data.” • Complete your chi-square table & calculate chi-square by including your null • hypothesis, degrees of freedom and p value.

  3. Critical Values of the Chi-Square Distribution

  4. Lab 7 alternative: Genetics of Corn – playing the role of Mendel • Each set of partners should obtain one ear of corn. • Study the ear and select 2 different traits that are easy to recognize. • Make a chi-square table with the 4 possible phenotypes. • Categorize the kernels on the entire ear by using tally marks for each of the • 4 phenotypes. Use 1 pin to mark the row that you started on and another • to mark the current row you are counting. • Count your tallies and record your data in the chi-square table. • Based on your observations of kernels and the ratios you counted, • hypothesize which traits are dominant & which are recessive. Then • hypothesize who the parents were that created the ear that you just counted. • (This is basically what Mendel had to do with the peas.) This will allow you • to predict a ratio/number of offspring from the total number of kernels counted. • Complete your chi-square table & calculate chi-square by including your null • hypothesis, degrees of freedom and p value. • Did you accept or reject your null hypothesis? Why? • What conclusions can you make about the parents of the ear you counted?

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