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A laboratory assignment for a genetics course. It includes instructions to visit a website and answer questions about dna, genes, chromosomes, proteins, and heredity. Additionally, students are asked to make predictions using punnet squares and pennies (or chips) to simulate crosses and compare the predicted and actual ratios.
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Laboratory 10
Part 1 (Take Home Assignment) Visit the following Site Location: http://gslc.genetics.utah.edu/ Click on the link that says "The Basics and Beyond" then ---Click on the link that says "Tour the Basics" Answer the following questions:
What is a Chromosome?
Procedure: To determine Actual Ratios, you will flip your coins 100 times, recording in the table below how often each combination came up. (Use tally marks to record your data then summarize as a number) Gene Combination (Genotype) Tally Total TT Tt tt Phenotypes Total Short toe (add TT + Tt ) Long Toe Since you flipped one hundred times, your totals above represent a Percentage. Your proportions from the Punnet Square in your prediction can also represent a Percentage. 1/4 = 25 % 2/4 = 50% 3/4= 75% 4/4 = 100% Now compare your predicted ratios to your actual Ratios in the chart below. Predicted (from the Square your did) Actual (from the flips) TT Tt tt Short Toe Long Toe Would you consider the predicted values to be the same, close to the same, or not at all the same?
Second You will repeat the procedure for parents that are Tt and t t
What percentage of your offspring are tt _____ What percentage are long toes
Compare the Predicted Ratios of the cross to the Actual Ratios. Predicted (from Square) Actual (from flips) Short Toe Long Toe