Lab Template
Week 5: Mendelian Genetics
What are the resulting phenotypes for each cross? Are there any blue kernels?
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As you complete the lab, record your answers in this template. Save the document as LastName_FirstName_BIO1020_W5A3, and submit it to the Dropbox. Full lab instructions and the rubric with which you will be evaluated can be found in the online classroom.
Activity
The laws of segregation, independent assortment, and dominance form the basis of all genetics. The ability to predict the results of crossing experiments and explain any variance between expected and observed results is still a vital part of our understanding of heredity. In this lab assignment you will experiment with monohybrid crosses and explore the role of chance in genetics.
Experiment 1
Questions
1. (10 points)
a. Set up and complete Punnett squares for each of the following crosses: (remember Y = yellow and y = blue)
· Y Y and Y y
| Parent 1 | |||
| Y | Y | ||
| Parent 2 | Y | YY | YY |
| y | Yy | yy |
· Y Y and y y
| Parent 1 | |||
| Y | Y | ||
| Parent 2 | Y | Yy | Yy |
| y | Yy | Yy |
b. What are the resulting phenotypes for each cross? Are there any blue kernels?
| Y Y and Y y | Y Y and y y |
|
The resulting phenotypes is that all the offsprings are yellow because all the offspring have at least one Y (yellow, dominant) allele
|
All the offsprings are yellow |
There are no blue kernels in either cross and all are yellow because the genotypes of all the kernels have at least one dominant (Y) gene which codes for yellow color.
2. (10 points)
a. Set up and complete a Punnett squarefor a cross of two of the F1 from the Y Y and y y cross above.
|
Parent 1 |
|||
| Y | Y | ||
| Parent 2 | y | Yy | Yy |